Derry 4 SW Weather Records (USC00362108)
Record envelope, standing records and threshold days for Derry 4 SW (USC00362108), Pennsylvania, United States, with 113 years of record.
Key Facts for Derry 4 SW
- Derry 4 SW (USC00362108) is a weather station in Pennsylvania, United States at 40.30 latitude and -79.33 longitude, 323 m (1,060 ft) above sea level.
- The station reports from 1896 to 2008, 113 years of record.
- 1,464 records set at Derry 4 SW still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Derry 4 SW tied a daily record low maximum temperature of 21.7 C (71.1 F) on 11 August 2008.
About the Station
- Location: Pennsylvania, United States, 40.30 latitude, -79.33 longitude.
- Elevation: 323 m (1,060 ft).
- Period of record: 1896 to 2008, 113 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
0 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 28.3 C (82.9 F) | -33.9 C (-29.0 F) | n/a | n/a |
| Feb | 26.1 C (79.0 F) | -29.4 C (-20.9 F) | n/a | n/a |
| Mar | 30.0 C (86.0 F) | -23.3 C (-9.9 F) | n/a | n/a |
| Apr | 33.3 C (91.9 F) | -15.6 C (3.9 F) | n/a | n/a |
| May | 37.8 C (100.0 F) | -6.1 C (21.0 F) | n/a | n/a |
| Jun | 36.7 C (98.1 F) | -2.2 C (28.0 F) | n/a | n/a |
| Jul | 40.6 C (105.1 F) | 2.2 C (36.0 F) | n/a | n/a |
| Aug | 38.9 C (102.0 F) | 0.0 C (32.0 F) | n/a | n/a |
| Sep | 37.8 C (100.0 F) | -4.4 C (24.1 F) | n/a | n/a |
| Oct | 34.4 C (93.9 F) | -10.0 C (14.0 F) | n/a | n/a |
| Nov | 32.2 C (90.0 F) | -18.3 C (-0.9 F) | n/a | n/a |
| Dec | 24.4 C (75.9 F) | -27.2 C (-17.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1896 | 4 |
| 1897 | 17 |
| 1898 | 24 |
| 1899 | 33 |
| 1900 | 47 |
| 1901 | 21 |
| 1902 | 12 |
| 1903 | 15 |
| 1904 | 17 |
| 1905 | 12 |
| 1906 | 14 |
| 1907 | 12 |
| 1908 | 34 |
| 1909 | 14 |
| 1910 | 11 |
| 1911 | 26 |
| 1912 | 10 |
| 1913 | 13 |
| 1914 | 29 |
| 1915 | 10 |
| 1916 | 13 |
| 1917 | 16 |
| 1918 | 21 |
| 1919 | 19 |
| 1920 | 10 |
| 1921 | 9 |
| 1922 | 12 |
| 1923 | 14 |
| 1924 | 11 |
| 1925 | 17 |
| 1926 | 12 |
| 1927 | 25 |
| 1928 | 16 |
| 1929 | 22 |
| 1930 | 35 |
| 1931 | 12 |
| 1932 | 20 |
| 1933 | 15 |
| 1934 | 12 |
| 1935 | 9 |
| 1936 | 23 |
| 1937 | 8 |
| 1938 | 11 |
| 1939 | 13 |
| 1940 | 14 |
| 1941 | 11 |
| 1942 | 14 |
| 1943 | 20 |
| 1944 | 10 |
| 1945 | 20 |
| 1946 | 6 |
| 1947 | 16 |
| 1948 | 11 |
| 1949 | 18 |
| 1950 | 20 |
| 1951 | 16 |
| 1952 | 15 |
| 1953 | 7 |
| 1954 | 19 |
| 1955 | 9 |
| 1956 | 14 |
| 1957 | 11 |
| 1958 | 12 |
| 1959 | 4 |
| 1963 | 1 |
| 1964 | 15 |
| 1965 | 12 |
| 1966 | 11 |
| 1967 | 12 |
| 1968 | 9 |
| 1969 | 2 |
| 1970 | 11 |
| 1971 | 6 |
| 1972 | 13 |
| 1973 | 4 |
| 1974 | 4 |
| 1975 | 2 |
| 1977 | 18 |
| 1979 | 23 |
| 1980 | 16 |
| 1981 | 23 |
| 1982 | 17 |
| 1983 | 12 |
| 1984 | 21 |
| 1985 | 28 |
| 1986 | 12 |
| 1987 | 4 |
| 1988 | 20 |
| 1989 | 15 |
| 1990 | 10 |
| 1991 | 9 |
| 1992 | 8 |
| 1993 | 7 |
| 1994 | 13 |
| 1995 | 5 |
| 1996 | 9 |
| 1997 | 7 |
| 1998 | 8 |
| 1999 | 4 |
| 2000 | 10 |
| 2001 | 8 |
| 2002 | 7 |
| 2003 | 6 |
| 2004 | 3 |
| 2005 | 3 |
| 2006 | 7 |
| 2007 | 5 |
| 2008 | 7 |
All-Time Record Progression
4 new records| Date | Kind | Detail |
|---|---|---|
| 1936-01-19 | Record daily snowfall | Record daily snowfall 40.6 cm (16.0 in) |
| 1942-03-03 | Record daily snowfall | Record daily snowfall 61.0 cm (24.0 in) |
| 1954-10-15 | Record daily precipitation | Record daily precipitation 127.0 mm (5.0 in) |
| 1972-06-23 | Record daily precipitation | Record daily precipitation 148.6 mm (5.9 in) |
Wettest Day of Each Month
Jun: 148.6 mm (5.9 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 94.7 mm (3.7 in) | 22 January 1927 |
| Feb | 54.1 mm (2.1 in) | 14 February 1971 |
| Mar | 81.5 mm (3.2 in) | 17 March 1936 |
| Apr | 61.2 mm (2.4 in) | 2 April 1901 |
| May | 69.1 mm (2.7 in) | 6 May 1971 |
| Jun | 148.6 mm (5.9 in) | 23 June 1972 |
| Jul | 124.0 mm (4.9 in) | 21 July 1916 |
| Aug | 104.6 mm (4.1 in) | 3 August 1935 |
| Sep | 140.0 mm (5.5 in) | 18 September 2004 |
| Oct | 127.0 mm (5.0 in) | 15 October 1954 |
| Nov | 55.9 mm (2.2 in) | 28 November 1921 |
| Dec | 53.3 mm (2.1 in) | 3 December 1991 |
Period of Record Coverage
1896 to 2008| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1896 | 94 | 26% | No |
| 1897 | 323 | 88% | No |
| 1898 | 364 | 100% | Yes |
| 1899 | 360 | 99% | Yes |
| 1900 | 359 | 98% | Yes |
| 1901 | 249 | 68% | No |
| 1902 | 363 | 99% | Yes |
| 1903 | 362 | 99% | Yes |
| 1904 | 361 | 99% | Yes |
| 1905 | 361 | 99% | Yes |
| 1906 | 363 | 99% | Yes |
| 1907 | 360 | 99% | Yes |
| 1908 | 361 | 99% | Yes |
| 1909 | 365 | 100% | Yes |
| 1910 | 349 | 96% | Yes |
| 1911 | 329 | 90% | Yes |
| 1912 | 358 | 98% | Yes |
| 1913 | 351 | 96% | Yes |
| 1914 | 359 | 98% | Yes |
| 1915 | 357 | 98% | Yes |
| 1916 | 366 | 100% | Yes |
| 1917 | 333 | 91% | Yes |
| 1918 | 362 | 99% | Yes |
| 1919 | 356 | 98% | Yes |
| 1920 | 365 | 100% | Yes |
| 1921 | 364 | 100% | Yes |
| 1922 | 362 | 99% | Yes |
| 1923 | 365 | 100% | Yes |
| 1924 | 365 | 100% | Yes |
| 1925 | 364 | 100% | Yes |
| 1926 | 364 | 100% | Yes |
| 1927 | 364 | 100% | Yes |
| 1928 | 364 | 99% | Yes |
| 1929 | 359 | 98% | Yes |
| 1930 | 358 | 98% | Yes |
| 1931 | 300 | 82% | No |
| 1932 | 362 | 99% | Yes |
| 1933 | 360 | 99% | Yes |
| 1934 | 361 | 99% | Yes |
| 1935 | 363 | 99% | Yes |
| 1936 | 364 | 99% | Yes |
| 1937 | 365 | 100% | Yes |
| 1938 | 363 | 99% | Yes |
| 1939 | 364 | 100% | Yes |
| 1940 | 362 | 99% | Yes |
| 1941 | 365 | 100% | Yes |
| 1942 | 365 | 100% | Yes |
| 1943 | 365 | 100% | Yes |
| 1944 | 366 | 100% | Yes |
| 1945 | 364 | 100% | Yes |
| 1946 | 329 | 90% | Yes |
| 1947 | 365 | 100% | Yes |
| 1948 | 366 | 100% | Yes |
| 1949 | 357 | 98% | Yes |
| 1950 | 334 | 92% | Yes |
| 1951 | 357 | 98% | Yes |
| 1952 | 365 | 100% | Yes |
| 1953 | 357 | 98% | Yes |
| 1954 | 357 | 98% | Yes |
| 1955 | 341 | 93% | Yes |
| 1956 | 324 | 89% | No |
| 1957 | 348 | 95% | Yes |
| 1958 | 361 | 99% | Yes |
| 1959 | 181 | 50% | No |
| 1963 | 31 | 8% | No |
| 1964 | 329 | 90% | No |
| 1965 | 365 | 100% | Yes |
| 1966 | 364 | 100% | Yes |
| 1967 | 365 | 100% | Yes |
| 1968 | 333 | 91% | Yes |
| 1969 | 184 | 50% | No |
| 1970 | 365 | 100% | Yes |
| 1971 | 364 | 100% | Yes |
| 1972 | 363 | 99% | Yes |
| 1973 | 119 | 33% | No |
| 1974 | 92 | 25% | No |
| 1975 | 181 | 50% | No |
| 1977 | 260 | 71% | No |
| 1978 | 38 | 10% | No |
| 1979 | 343 | 94% | Yes |
| 1980 | 324 | 89% | No |
| 1981 | 344 | 94% | Yes |
| 1982 | 359 | 98% | Yes |
| 1983 | 337 | 92% | Yes |
| 1984 | 360 | 98% | Yes |
| 1985 | 353 | 97% | Yes |
| 1986 | 346 | 95% | Yes |
| 1987 | 353 | 97% | Yes |
| 1988 | 357 | 98% | Yes |
| 1989 | 363 | 99% | Yes |
| 1990 | 329 | 90% | Yes |
| 1991 | 361 | 99% | Yes |
| 1992 | 354 | 97% | Yes |
| 1993 | 329 | 90% | Yes |
| 1994 | 360 | 99% | Yes |
| 1995 | 363 | 99% | Yes |
| 1996 | 346 | 95% | Yes |
| 1997 | 325 | 89% | No |
| 1998 | 346 | 95% | Yes |
| 1999 | 337 | 92% | Yes |
| 2000 | 325 | 89% | No |
| 2001 | 335 | 92% | Yes |
| 2002 | 337 | 92% | Yes |
| 2003 | 339 | 93% | Yes |
| 2004 | 341 | 93% | Yes |
| 2005 | 338 | 93% | Yes |
| 2006 | 317 | 87% | No |
| 2007 | 306 | 84% | No |
| 2008 | 200 | 55% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 11 August 2008 | Derry 4 SW, US | daily low max (Tie) | 21.7 C (71.1 F) | tie | 54 years | 6 of 100 (Routine) |
| 8 June 2008 | Derry 4 SW, US | daily high min | 22.2 C (72.0 F) | 1.1 C (2.0 F) | 62 years | 30 of 100 (Routine) |
| 7 June 2008 | Derry 4 SW, US | daily high min | 22.8 C (73.0 F) | 1.1 C (2.0 F) | 72 years | 33 of 100 (Routine) |
| 1 June 2008 | Derry 4 SW, US | daily rain | 48.3 mm (1.9 in) | 16.5 mm (0.6 in) | 64 years | 41 of 100 (Notable) |
| 22 May 2008 | Derry 4 SW, US | daily low max (Tie) | 13.3 C (55.9 F) | tie | 108 years | 10 of 100 (Routine) |
| 12 May 2008 | Derry 4 SW, US | daily low max | 9.4 C (48.9 F) | 1.7 C (3.1 F) | 70 years | 34 of 100 (Routine) |
| 6 February 2008 | Derry 4 SW, US | daily high max | 18.3 C (64.9 F) | 0.5 C (0.9 F) | 69 years | 30 of 100 (Routine) |
| 6 February 2008 | Derry 4 SW, US | monthly high min (Tie) | 14.4 C (57.9 F) | tie | 75 years | 10 of 100 (Routine) |
| 5 February 2008 | Derry 4 SW, US | daily high max | 18.9 C (66.0 F) | 0.6 C (1.1 F) | 69 years | 30 of 100 (Routine) |
| 8 January 2008 | Derry 4 SW, US | daily high max | 22.2 C (72.0 F) | 1.6 C (2.9 F) | 70 years | 33 of 100 (Routine) |
| 14 December 2007 | Derry 4 SW, US | daily rain | 26.9 mm (1.1 in) | 4.0 mm (0.16 in) | 21 years | 21 of 100 (Routine) |
| 11 December 2007 | Derry 4 SW, US | daily high max (Tie) | 17.8 C (64.0 F) | tie | 96 years | 9 of 100 (Routine) |
| 27 November 2007 | Derry 4 SW, US | daily rain | 46.2 mm (1.8 in) | 11.1 mm (0.4 in) | 21 years | 29 of 100 (Routine) |
| 10 October 2007 | Derry 4 SW, US | daily rain | 34.8 mm (1.4 in) | 7.1 mm (0.28 in) | 94 years | 45 of 100 (Notable) |
| 9 October 2007 | Derry 4 SW, US | daily high min | 18.9 C (66.0 F) | 0.6 C (1.1 F) | 68 years | 31 of 100 (Routine) |
| 15 September 2007 | Derry 4 SW, US | daily low max | 15.6 C (60.1 F) | 1.1 C (2.0 F) | 84 years | 37 of 100 (Notable) |
| 19 August 2007 | Derry 4 SW, US | daily low max | 18.9 C (66.0 F) | 2.2 C (4.0 F) | 102 years | 46 of 100 (Notable) |
| 10 August 2007 | Derry 4 SW, US | daily rain | 61.5 mm (2.4 in) | 12.5 mm (0.5 in) | 68 years | 39 of 100 (Notable) |
| 6 August 2007 | Derry 4 SW, US | daily rain | 43.2 mm (1.7 in) | 1.3 mm (0.05 in) | 62 years | 29 of 100 (Routine) |
| 8 April 2007 | Derry 4 SW, US | daily low max (Tie) | 0.6 C (33.1 F) | tie | 86 years | 9 of 100 (Routine) |
Climate Trend
62 complete years, 1898 to 2005| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1898 | 11.6 C | +0.77 C |
| 1899 | 11.1 C | +0.34 C |
| 1900 | 11.8 C | +0.96 C |
| 1903 | 10.5 C | -0.30 C |
| 1904 | 9.8 C | -1.01 C |
| 1905 | 10.3 C | -0.51 C |
| 1906 | 11.7 C | +0.88 C |
| 1907 | 10.3 C | -0.54 C |
| 1908 | 11.5 C | +0.67 C |
| 1909 | 10.9 C | +0.12 C |
| 1912 | 10.2 C | -0.64 C |
| 1913 | 11.5 C | +0.71 C |
| 1914 | 10.4 C | -0.37 C |
| 1915 | 10.8 C | +0.03 C |
| 1916 | 10.8 C | +0.01 C |
| 1918 | 10.8 C | -0.01 C |
| 1919 | 11.1 C | +0.26 C |
| 1920 | 9.6 C | -1.16 C |
| 1921 | 11.9 C | +1.10 C |
| 1923 | 10.6 C | -0.15 C |
| 1924 | 9.8 C | -1.04 C |
| 1925 | 10.9 C | +0.09 C |
| 1926 | 10.2 C | -0.63 C |
| 1927 | 11.2 C | +0.36 C |
| 1928 | 10.2 C | -0.64 C |
| 1929 | 10.2 C | -0.61 C |
| 1930 | 10.9 C | +0.05 C |
| 1932 | 10.8 C | +0.04 C |
| 1933 | 11.1 C | +0.30 C |
| 1934 | 11.1 C | +0.30 C |
| 1935 | 11.0 C | +0.18 C |
| 1936 | 10.9 C | +0.10 C |
| 1937 | 11.0 C | +0.17 C |
| 1938 | 12.1 C | +1.35 C |
| 1939 | 12.1 C | +1.27 C |
| 1940 | 10.1 C | -0.73 C |
| 1941 | 11.4 C | +0.63 C |
| 1942 | 11.3 C | +0.53 C |
| 1943 | 10.7 C | -0.08 C |
| 1944 | 11.3 C | +0.47 C |
| 1945 | 11.1 C | +0.34 C |
| 1947 | 10.9 C | +0.13 C |
| 1948 | 11.3 C | +0.48 C |
| 1949 | 12.0 C | +1.22 C |
| 1951 | 11.3 C | +0.48 C |
| 1952 | 11.5 C | +0.71 C |
| 1953 | 12.0 C | +1.23 C |
| 1954 | 11.3 C | +0.54 C |
| 1958 | 9.8 C | -1.02 C |
| 1965 | 10.9 C | +0.10 C |
| 1966 | 10.2 C | -0.60 C |
| 1967 | 10.5 C | -0.33 C |
| 1970 | 11.1 C | +0.30 C |
| 1971 | 11.0 C | +0.21 C |
| 1972 | 10.6 C | -0.16 C |
| 1980 | 8.7 C | -2.13 C |
| 1984 | 8.7 C | -2.10 C |
| 1985 | 9.2 C | -1.62 C |
| 2002 | 11.2 C | +0.37 C |
| 2003 | 9.8 C | -0.95 C |
| 2004 | 10.4 C | -0.39 C |
| 2005 | 10.8 C | -0.04 C |
The fitted trend in annual mean temperature here over 1898 to 2005 is -0.07 C (-0.13 to 0.00) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.12 F (-0.24 to 0.00) per decade. The slope is a straight line fitted to 62 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | -0.07 C (-0.13 to 0.00) per decade | -0.12 F (-0.24 to 0.00) per decade | 1898 to 2005 | 62 | Not clearly different from zero |
| Mean daily maximum | -0.1 C (-0.2 to -0.1) per decade | -0.2 F (-0.4 to -0.1) per decade | 1898 to 2005 | 62 | Fall |
| Mean daily minimum | -0.01 C (-0.10 to 0.09) per decade | -0.01 F (-0.18 to 0.15) per decade | 1898 to 2005 | 62 | Not clearly different from zero |
A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.
Extremes by Year
1896 to 2008| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 40.6 C (105.1 F) | 1911 | 34.4 C (93.9 F) | 109 |
| Coldest night (TNn) | -33.9 C (-29.0 F) | 1912 | -21.1 C (-6.0 F) | 109 |
| Wettest day (Rx1day) | 148.6 mm (5.9 in) | 1972 | 53.8 mm (2.1 in) | 109 |
| Wettest five days (Rx5day) | 270.8 mm (10.7 in) | 1972 | 88.9 mm (3.5 in) | 109 |
| Longest dry spell (CDD) | 29 days | 1932 | 13 days | 109 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1896 | 26.1 C (79.0 F) |
| 1897 | 39.4 C (102.9 F) |
| 1898 | 37.8 C (100.0 F) |
| 1899 | 37.8 C (100.0 F) |
| 1900 | 38.9 C (102.0 F) |
| 1901 | 36.7 C (98.1 F) |
| 1902 | 33.3 C (91.9 F) |
| 1903 | 33.9 C (93.0 F) |
| 1904 | 34.4 C (93.9 F) |
| 1905 | 33.9 C (93.0 F) |
| 1906 | 33.9 C (93.0 F) |
| 1907 | 35.0 C (95.0 F) |
| 1908 | 36.7 C (98.1 F) |
| 1909 | 36.1 C (97.0 F) |
| 1910 | 33.9 C (93.0 F) |
| 1911 | 40.6 C (105.1 F) |
| 1912 | 34.4 C (93.9 F) |
| 1913 | 35.6 C (96.1 F) |
| 1914 | 35.0 C (95.0 F) |
| 1915 | 33.9 C (93.0 F) |
| 1916 | 36.7 C (98.1 F) |
| 1917 | 35.6 C (96.1 F) |
| 1918 | 38.9 C (102.0 F) |
| 1919 | 37.2 C (99.0 F) |
| 1920 | 32.8 C (91.0 F) |
| 1921 | 36.1 C (97.0 F) |
| 1922 | 36.7 C (98.1 F) |
| 1923 | 35.0 C (95.0 F) |
| 1924 | 35.6 C (96.1 F) |
| 1925 | 34.4 C (93.9 F) |
| 1926 | 36.7 C (98.1 F) |
| 1927 | 33.3 C (91.9 F) |
| 1928 | 33.3 C (91.9 F) |
| 1929 | 31.7 C (89.1 F) |
| 1930 | 37.8 C (100.0 F) |
| 1931 | 31.7 C (89.1 F) |
| 1932 | 31.7 C (89.1 F) |
| 1933 | 36.7 C (98.1 F) |
| 1934 | 35.6 C (96.1 F) |
| 1935 | 33.3 C (91.9 F) |
| 1936 | 38.3 C (100.9 F) |
| 1937 | 34.4 C (93.9 F) |
| 1938 | 34.4 C (93.9 F) |
| 1939 | 35.0 C (95.0 F) |
| 1940 | 33.9 C (93.0 F) |
| 1941 | 34.4 C (93.9 F) |
| 1942 | 35.0 C (95.0 F) |
| 1943 | 33.9 C (93.0 F) |
| 1944 | 35.0 C (95.0 F) |
| 1945 | 34.4 C (93.9 F) |
| 1946 | 34.4 C (93.9 F) |
| 1947 | 33.9 C (93.0 F) |
| 1948 | 36.1 C (97.0 F) |
| 1949 | 36.1 C (97.0 F) |
| 1950 | 33.3 C (91.9 F) |
| 1951 | 33.9 C (93.0 F) |
| 1952 | 35.0 C (95.0 F) |
| 1953 | 36.7 C (98.1 F) |
| 1954 | 36.7 C (98.1 F) |
| 1955 | 34.4 C (93.9 F) |
| 1956 | 33.3 C (91.9 F) |
| 1957 | 34.4 C (93.9 F) |
| 1958 | 32.2 C (90.0 F) |
| 1959 | 33.3 C (91.9 F) |
| 1963 | 12.2 C (54.0 F) |
| 1964 | 33.9 C (93.0 F) |
| 1965 | 35.0 C (95.0 F) |
| 1966 | 35.6 C (96.1 F) |
| 1967 | 33.3 C (91.9 F) |
| 1968 | 34.4 C (93.9 F) |
| 1969 | 31.7 C (89.1 F) |
| 1970 | 32.8 C (91.0 F) |
| 1971 | 33.3 C (91.9 F) |
| 1972 | 32.2 C (90.0 F) |
| 1973 | 27.8 C (82.0 F) |
| 1974 | 24.4 C (75.9 F) |
| 1975 | 35.0 C (95.0 F) |
| 1977 | 33.9 C (93.0 F) |
| 1978 | 22.8 C (73.0 F) |
| 1979 | 33.9 C (93.0 F) |
| 1980 | 35.0 C (95.0 F) |
| 1981 | 32.8 C (91.0 F) |
| 1982 | 33.3 C (91.9 F) |
| 1983 | 36.1 C (97.0 F) |
| 1984 | 33.3 C (91.9 F) |
| 1985 | 33.9 C (93.0 F) |
| 1986 | 35.0 C (95.0 F) |
| 1987 | 35.6 C (96.1 F) |
| 1988 | 38.9 C (102.0 F) |
| 1989 | 34.4 C (93.9 F) |
| 1990 | 32.2 C (90.0 F) |
| 1991 | 36.1 C (97.0 F) |
| 1992 | 32.2 C (90.0 F) |
| 1993 | 33.9 C (93.0 F) |
| 1994 | 33.9 C (93.0 F) |
| 1995 | 36.1 C (97.0 F) |
| 1996 | 32.8 C (91.0 F) |
| 1997 | 34.4 C (93.9 F) |
| 1998 | 32.8 C (91.0 F) |
| 1999 | 35.6 C (96.1 F) |
| 2000 | 32.2 C (90.0 F) |
| 2001 | 34.4 C (93.9 F) |
| 2002 | 35.0 C (95.0 F) |
| 2003 | 31.1 C (88.0 F) |
| 2004 | 31.1 C (88.0 F) |
| 2005 | 33.9 C (93.0 F) |
| 2006 | 33.9 C (93.0 F) |
| 2007 | 33.9 C (93.0 F) |
| 2008 | 33.9 C (93.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1896 | -13.9 C (7.0 F) |
| 1897 | -17.8 C (0.0 F) |
| 1898 | -21.7 C (-7.1 F) |
| 1899 | -29.4 C (-20.9 F) |
| 1900 | -22.2 C (-8.0 F) |
| 1901 | -19.4 C (-2.9 F) |
| 1902 | -17.8 C (0.0 F) |
| 1903 | -21.1 C (-6.0 F) |
| 1904 | -28.9 C (-20.0 F) |
| 1905 | -26.1 C (-15.0 F) |
| 1906 | -23.9 C (-11.0 F) |
| 1907 | -27.8 C (-18.0 F) |
| 1908 | -21.7 C (-7.1 F) |
| 1909 | -19.4 C (-2.9 F) |
| 1910 | -18.3 C (-0.9 F) |
| 1911 | -15.6 C (3.9 F) |
| 1912 | -33.9 C (-29.0 F) |
| 1913 | -16.7 C (1.9 F) |
| 1914 | -26.7 C (-16.1 F) |
| 1915 | -18.9 C (-2.0 F) |
| 1916 | -25.0 C (-13.0 F) |
| 1917 | -27.2 C (-17.0 F) |
| 1918 | -25.6 C (-14.1 F) |
| 1919 | -21.7 C (-7.1 F) |
| 1920 | -19.4 C (-2.9 F) |
| 1921 | -21.1 C (-6.0 F) |
| 1922 | -22.8 C (-9.0 F) |
| 1923 | -20.6 C (-5.1 F) |
| 1924 | -22.2 C (-8.0 F) |
| 1925 | -26.1 C (-15.0 F) |
| 1926 | -21.7 C (-7.1 F) |
| 1927 | -18.3 C (-0.9 F) |
| 1928 | -19.4 C (-2.9 F) |
| 1929 | -21.1 C (-6.0 F) |
| 1930 | -21.1 C (-6.0 F) |
| 1931 | -15.0 C (5.0 F) |
| 1932 | -19.4 C (-2.9 F) |
| 1933 | -21.1 C (-6.0 F) |
| 1934 | -28.3 C (-18.9 F) |
| 1935 | -20.6 C (-5.1 F) |
| 1936 | -25.6 C (-14.1 F) |
| 1937 | -18.3 C (-0.9 F) |
| 1938 | -16.7 C (1.9 F) |
| 1939 | -17.2 C (1.0 F) |
| 1940 | -22.2 C (-8.0 F) |
| 1941 | -17.2 C (1.0 F) |
| 1942 | -23.9 C (-11.0 F) |
| 1943 | -23.9 C (-11.0 F) |
| 1944 | -23.9 C (-11.0 F) |
| 1945 | -25.6 C (-14.1 F) |
| 1946 | -17.8 C (0.0 F) |
| 1947 | -18.9 C (-2.0 F) |
| 1948 | -23.3 C (-9.9 F) |
| 1949 | -15.0 C (5.0 F) |
| 1950 | -22.8 C (-9.0 F) |
| 1951 | -19.4 C (-2.9 F) |
| 1952 | -15.0 C (5.0 F) |
| 1953 | -12.8 C (9.0 F) |
| 1954 | -18.9 C (-2.0 F) |
| 1955 | -24.4 C (-11.9 F) |
| 1956 | -15.0 C (5.0 F) |
| 1957 | -21.1 C (-6.0 F) |
| 1958 | -22.8 C (-9.0 F) |
| 1959 | -18.3 C (-0.9 F) |
| 1963 | -21.1 C (-6.0 F) |
| 1964 | -17.8 C (0.0 F) |
| 1965 | -23.9 C (-11.0 F) |
| 1966 | -25.6 C (-14.1 F) |
| 1967 | -17.8 C (0.0 F) |
| 1968 | -22.2 C (-8.0 F) |
| 1969 | -17.2 C (1.0 F) |
| 1970 | -20.6 C (-5.1 F) |
| 1971 | -20.6 C (-5.1 F) |
| 1972 | -22.2 C (-8.0 F) |
| 1973 | -21.1 C (-6.0 F) |
| 1974 | -10.0 C (14.0 F) |
| 1975 | -19.4 C (-2.9 F) |
| 1977 | -26.1 C (-15.0 F) |
| 1978 | -2.8 C (27.0 F) |
| 1979 | -28.9 C (-20.0 F) |
| 1980 | -25.6 C (-14.1 F) |
| 1981 | -27.2 C (-17.0 F) |
| 1982 | -26.7 C (-16.1 F) |
| 1983 | -24.4 C (-11.9 F) |
| 1984 | -29.4 C (-20.9 F) |
| 1985 | -33.9 C (-29.0 F) |
| 1986 | -23.3 C (-9.9 F) |
| 1987 | -20.0 C (-4.0 F) |
| 1988 | -20.6 C (-5.1 F) |
| 1989 | -23.9 C (-11.0 F) |
| 1990 | -19.4 C (-2.9 F) |
| 1991 | -16.1 C (3.0 F) |
| 1992 | -18.9 C (-2.0 F) |
| 1993 | -19.4 C (-2.9 F) |
| 1994 | -30.6 C (-23.1 F) |
| 1995 | -19.4 C (-2.9 F) |
| 1996 | -23.3 C (-9.9 F) |
| 1997 | -20.0 C (-4.0 F) |
| 1998 | -18.9 C (-2.0 F) |
| 1999 | -18.3 C (-0.9 F) |
| 2000 | -19.4 C (-2.9 F) |
| 2001 | -13.3 C (8.1 F) |
| 2002 | -13.9 C (7.0 F) |
| 2003 | -22.2 C (-8.0 F) |
| 2004 | -22.2 C (-8.0 F) |
| 2005 | -18.3 C (-0.9 F) |
| 2006 | -10.0 C (14.0 F) |
| 2007 | -20.6 C (-5.1 F) |
| 2008 | -16.7 C (1.9 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1896 | 49.0 mm (1.9 in) |
| 1897 | 44.7 mm (1.8 in) |
| 1898 | 44.7 mm (1.8 in) |
| 1899 | 58.2 mm (2.3 in) |
| 1900 | 49.8 mm (2.0 in) |
| 1901 | 61.2 mm (2.4 in) |
| 1902 | 41.9 mm (1.6 in) |
| 1903 | 52.3 mm (2.1 in) |
| 1904 | 51.3 mm (2.0 in) |
| 1905 | 57.2 mm (2.3 in) |
| 1906 | 65.5 mm (2.6 in) |
| 1907 | 54.1 mm (2.1 in) |
| 1908 | 56.4 mm (2.2 in) |
| 1909 | 43.7 mm (1.7 in) |
| 1910 | 27.9 mm (1.1 in) |
| 1911 | 74.9 mm (2.9 in) |
| 1912 | 98.0 mm (3.9 in) |
| 1913 | 52.6 mm (2.1 in) |
| 1914 | 43.2 mm (1.7 in) |
| 1915 | 48.8 mm (1.9 in) |
| 1916 | 124.0 mm (4.9 in) |
| 1917 | 57.7 mm (2.3 in) |
| 1918 | 62.0 mm (2.4 in) |
| 1919 | 54.6 mm (2.1 in) |
| 1920 | 53.8 mm (2.1 in) |
| 1921 | 91.4 mm (3.6 in) |
| 1922 | 38.1 mm (1.5 in) |
| 1923 | 36.6 mm (1.4 in) |
| 1924 | 97.0 mm (3.8 in) |
| 1925 | 48.5 mm (1.9 in) |
| 1926 | 88.1 mm (3.5 in) |
| 1927 | 94.7 mm (3.7 in) |
| 1928 | 46.0 mm (1.8 in) |
| 1929 | 73.4 mm (2.9 in) |
| 1930 | 95.3 mm (3.8 in) |
| 1931 | 39.4 mm (1.6 in) |
| 1932 | 34.8 mm (1.4 in) |
| 1933 | 41.9 mm (1.6 in) |
| 1934 | 64.8 mm (2.6 in) |
| 1935 | 104.6 mm (4.1 in) |
| 1936 | 81.5 mm (3.2 in) |
| 1937 | 66.0 mm (2.6 in) |
| 1938 | 49.0 mm (1.9 in) |
| 1939 | 43.2 mm (1.7 in) |
| 1940 | 37.8 mm (1.5 in) |
| 1941 | 59.7 mm (2.4 in) |
| 1942 | 62.0 mm (2.4 in) |
| 1943 | 50.3 mm (2.0 in) |
| 1944 | 51.3 mm (2.0 in) |
| 1945 | 63.5 mm (2.5 in) |
| 1946 | 47.5 mm (1.9 in) |
| 1947 | 61.2 mm (2.4 in) |
| 1948 | 56.4 mm (2.2 in) |
| 1949 | 45.2 mm (1.8 in) |
| 1950 | 61.0 mm (2.4 in) |
| 1951 | 66.8 mm (2.6 in) |
| 1952 | 66.0 mm (2.6 in) |
| 1953 | 53.3 mm (2.1 in) |
| 1954 | 127.0 mm (5.0 in) |
| 1955 | 65.0 mm (2.6 in) |
| 1956 | 85.1 mm (3.4 in) |
| 1957 | 37.1 mm (1.5 in) |
| 1958 | 47.8 mm (1.9 in) |
| 1959 | 30.0 mm (1.2 in) |
| 1963 | 14.0 mm (0.6 in) |
| 1964 | 62.5 mm (2.5 in) |
| 1965 | 30.7 mm (1.2 in) |
| 1966 | 47.0 mm (1.9 in) |
| 1967 | 73.9 mm (2.9 in) |
| 1968 | 67.3 mm (2.6 in) |
| 1969 | 57.2 mm (2.3 in) |
| 1970 | 95.5 mm (3.8 in) |
| 1971 | 71.1 mm (2.8 in) |
| 1972 | 148.6 mm (5.9 in) |
| 1973 | 26.7 mm (1.1 in) |
| 1974 | 30.0 mm (1.2 in) |
| 1975 | 44.5 mm (1.8 in) |
| 1977 | 51.3 mm (2.0 in) |
| 1978 | 38.1 mm (1.5 in) |
| 1979 | 46.5 mm (1.8 in) |
| 1980 | 65.3 mm (2.6 in) |
| 1981 | 53.3 mm (2.1 in) |
| 1982 | 61.0 mm (2.4 in) |
| 1983 | 52.6 mm (2.1 in) |
| 1984 | 45.5 mm (1.8 in) |
| 1985 | 105.4 mm (4.1 in) |
| 1986 | 63.5 mm (2.5 in) |
| 1987 | 54.6 mm (2.1 in) |
| 1988 | 66.0 mm (2.6 in) |
| 1989 | 53.3 mm (2.1 in) |
| 1990 | 43.4 mm (1.7 in) |
| 1991 | 53.3 mm (2.1 in) |
| 1992 | 50.8 mm (2.0 in) |
| 1993 | 58.4 mm (2.3 in) |
| 1994 | 54.1 mm (2.1 in) |
| 1995 | 36.6 mm (1.4 in) |
| 1996 | 53.8 mm (2.1 in) |
| 1997 | 51.8 mm (2.0 in) |
| 1998 | 51.8 mm (2.0 in) |
| 1999 | 52.1 mm (2.1 in) |
| 2000 | 79.5 mm (3.1 in) |
| 2001 | 33.5 mm (1.3 in) |
| 2002 | 52.8 mm (2.1 in) |
| 2003 | 50.8 mm (2.0 in) |
| 2004 | 140.0 mm (5.5 in) |
| 2005 | 59.4 mm (2.3 in) |
| 2006 | 90.9 mm (3.6 in) |
| 2007 | 61.5 mm (2.4 in) |
| 2008 | 48.3 mm (1.9 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1896 | 69.6 mm (2.7 in) |
| 1897 | 82.0 mm (3.2 in) |
| 1898 | 92.5 mm (3.6 in) |
| 1899 | 74.4 mm (2.9 in) |
| 1900 | 86.3 mm (3.4 in) |
| 1901 | 109.3 mm (4.3 in) |
| 1902 | 81.3 mm (3.2 in) |
| 1903 | 99.6 mm (3.9 in) |
| 1904 | 82.1 mm (3.2 in) |
| 1905 | 89.7 mm (3.5 in) |
| 1906 | 85.1 mm (3.4 in) |
| 1907 | 88.0 mm (3.5 in) |
| 1908 | 85.7 mm (3.4 in) |
| 1909 | 58.0 mm (2.3 in) |
| 1910 | 64.0 mm (2.5 in) |
| 1911 | 65.8 mm (2.6 in) |
| 1912 | 118.8 mm (4.7 in) |
| 1913 | 74.8 mm (2.9 in) |
| 1914 | 75.5 mm (3.0 in) |
| 1915 | 73.7 mm (2.9 in) |
| 1916 | 127.3 mm (5.0 in) |
| 1917 | 68.1 mm (2.7 in) |
| 1918 | 131.6 mm (5.2 in) |
| 1919 | 90.7 mm (3.6 in) |
| 1920 | 80.7 mm (3.2 in) |
| 1921 | 132.8 mm (5.2 in) |
| 1922 | 63.3 mm (2.5 in) |
| 1923 | 75.7 mm (3.0 in) |
| 1924 | 109.7 mm (4.3 in) |
| 1925 | 63.7 mm (2.5 in) |
| 1926 | 184.1 mm (7.2 in) |
| 1927 | 145.0 mm (5.7 in) |
| 1928 | 89.9 mm (3.5 in) |
| 1929 | 88.9 mm (3.5 in) |
| 1930 | 104.7 mm (4.1 in) |
| 1931 | 68.9 mm (2.7 in) |
| 1932 | 82.4 mm (3.2 in) |
| 1933 | 77.2 mm (3.0 in) |
| 1934 | 116.1 mm (4.6 in) |
| 1935 | 201.6 mm (7.9 in) |
| 1936 | 146.5 mm (5.8 in) |
| 1937 | 105.8 mm (4.2 in) |
| 1938 | 93.4 mm (3.7 in) |
| 1939 | 87.1 mm (3.4 in) |
| 1940 | 89.9 mm (3.5 in) |
| 1941 | 102.5 mm (4.0 in) |
| 1942 | 77.0 mm (3.0 in) |
| 1943 | 87.4 mm (3.4 in) |
| 1944 | 81.7 mm (3.2 in) |
| 1945 | 104.7 mm (4.1 in) |
| 1946 | 65.8 mm (2.6 in) |
| 1947 | 94.5 mm (3.7 in) |
| 1948 | 112.5 mm (4.4 in) |
| 1949 | 67.8 mm (2.7 in) |
| 1950 | 111.2 mm (4.4 in) |
| 1951 | 129.6 mm (5.1 in) |
| 1952 | 93.0 mm (3.7 in) |
| 1953 | 93.0 mm (3.7 in) |
| 1954 | 167.6 mm (6.6 in) |
| 1955 | 97.0 mm (3.8 in) |
| 1956 | 130.3 mm (5.1 in) |
| 1957 | 74.7 mm (2.9 in) |
| 1958 | 106.5 mm (4.2 in) |
| 1959 | 50.4 mm (2.0 in) |
| 1963 | 26.1 mm (1.0 in) |
| 1964 | 91.7 mm (3.6 in) |
| 1965 | 51.1 mm (2.0 in) |
| 1966 | 86.1 mm (3.4 in) |
| 1967 | 134.7 mm (5.3 in) |
| 1968 | 80.8 mm (3.2 in) |
| 1969 | 65.9 mm (2.6 in) |
| 1970 | 169.7 mm (6.7 in) |
| 1971 | 110.8 mm (4.4 in) |
| 1972 | 270.8 mm (10.7 in) |
| 1973 | 60.5 mm (2.4 in) |
| 1974 | 56.6 mm (2.2 in) |
| 1975 | 85.6 mm (3.4 in) |
| 1977 | 64.2 mm (2.5 in) |
| 1978 | 54.6 mm (2.1 in) |
| 1979 | 79.3 mm (3.1 in) |
| 1980 | 96.0 mm (3.8 in) |
| 1981 | 106.1 mm (4.2 in) |
| 1982 | 87.9 mm (3.5 in) |
| 1983 | 87.2 mm (3.4 in) |
| 1984 | 67.1 mm (2.6 in) |
| 1985 | 127.1 mm (5.0 in) |
| 1986 | 99.6 mm (3.9 in) |
| 1987 | 99.0 mm (3.9 in) |
| 1988 | 92.4 mm (3.6 in) |
| 1989 | 116.3 mm (4.6 in) |
| 1990 | 82.6 mm (3.3 in) |
| 1991 | 73.1 mm (2.9 in) |
| 1992 | 123.2 mm (4.9 in) |
| 1993 | 88.1 mm (3.5 in) |
| 1994 | 87.3 mm (3.4 in) |
| 1995 | 60.5 mm (2.4 in) |
| 1996 | 85.3 mm (3.4 in) |
| 1997 | 114.0 mm (4.5 in) |
| 1998 | 109.7 mm (4.3 in) |
| 1999 | 77.4 mm (3.0 in) |
| 2000 | 93.7 mm (3.7 in) |
| 2001 | 61.5 mm (2.4 in) |
| 2002 | 57.9 mm (2.3 in) |
| 2003 | 117.3 mm (4.6 in) |
| 2004 | 141.5 mm (5.6 in) |
| 2005 | 138.8 mm (5.5 in) |
| 2006 | 116.3 mm (4.6 in) |
| 2007 | 142.8 mm (5.6 in) |
| 2008 | 113.8 mm (4.5 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1896 | 18 days |
| 1897 | 13 days |
| 1898 | 14 days |
| 1899 | 19 days |
| 1900 | 17 days |
| 1901 | 11 days |
| 1902 | 12 days |
| 1903 | 18 days |
| 1904 | 15 days |
| 1905 | 15 days |
| 1906 | 11 days |
| 1907 | 11 days |
| 1908 | 21 days |
| 1909 | 13 days |
| 1910 | 13 days |
| 1911 | 12 days |
| 1912 | 13 days |
| 1913 | 13 days |
| 1914 | 14 days |
| 1915 | 12 days |
| 1916 | 10 days |
| 1917 | 21 days |
| 1918 | 19 days |
| 1919 | 10 days |
| 1920 | 11 days |
| 1921 | 12 days |
| 1922 | 24 days |
| 1923 | 20 days |
| 1924 | 25 days |
| 1925 | 19 days |
| 1926 | 14 days |
| 1927 | 14 days |
| 1928 | 10 days |
| 1929 | 14 days |
| 1930 | 22 days |
| 1931 | 10 days |
| 1932 | 29 days |
| 1933 | 12 days |
| 1934 | 16 days |
| 1935 | 14 days |
| 1936 | 16 days |
| 1937 | 14 days |
| 1938 | 13 days |
| 1939 | 14 days |
| 1940 | 13 days |
| 1941 | 19 days |
| 1942 | 21 days |
| 1943 | 15 days |
| 1944 | 17 days |
| 1945 | 11 days |
| 1946 | 11 days |
| 1947 | 19 days |
| 1948 | 16 days |
| 1949 | 13 days |
| 1950 | 16 days |
| 1951 | 16 days |
| 1952 | 21 days |
| 1953 | 18 days |
| 1954 | 13 days |
| 1955 | 12 days |
| 1956 | 13 days |
| 1957 | 20 days |
| 1958 | 12 days |
| 1959 | 9 days |
| 1963 | 4 days |
| 1964 | 26 days |
| 1965 | 13 days |
| 1966 | 12 days |
| 1967 | 13 days |
| 1968 | 13 days |
| 1969 | 13 days |
| 1970 | 15 days |
| 1971 | 12 days |
| 1972 | 10 days |
| 1973 | 10 days |
| 1974 | 10 days |
| 1975 | 15 days |
| 1977 | 15 days |
| 1978 | 7 days |
| 1979 | 11 days |
| 1980 | 11 days |
| 1981 | 12 days |
| 1982 | 12 days |
| 1983 | 15 days |
| 1984 | 9 days |
| 1985 | 18 days |
| 1986 | 9 days |
| 1987 | 10 days |
| 1988 | 10 days |
| 1989 | 9 days |
| 1990 | 12 days |
| 1991 | 16 days |
| 1992 | 9 days |
| 1993 | 12 days |
| 1994 | 15 days |
| 1995 | 18 days |
| 1996 | 10 days |
| 1997 | 12 days |
| 1998 | 10 days |
| 1999 | 14 days |
| 2000 | 15 days |
| 2001 | 13 days |
| 2002 | 16 days |
| 2003 | 13 days |
| 2004 | 12 days |
| 2005 | 15 days |
| 2006 | 14 days |
| 2007 | 17 days |
| 2008 | 13 days |
Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.
Frost Dates and Growing Season
62 years with a frostAcross 62 years with a frost, the median last spring frost at Derry 4 SW falls on 10 May and the median first autumn frost on 6 October, which leaves a median of 154 days between them.
In 1937 to 2005 the median growing season was 156 days. That is 3 days more than in 1898 to 1934.
Fitted over all years, the growing season changes by +1.2 days per decade at this station.
| Measure | Median, all years | Earliest period (1898 to 1934) | Recent period (1937 to 2005) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 10 May | 11 May | 6 May | 5 days earlier | -0.1 days per decade |
| First autumn frost | 6 October | 7 October | 6 October | 1 day earlier | +1.1 days per decade |
| Growing days | 154 days | 153 days | 156 days | 3 days more | +1.2 days per decade |
A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.
Rainfall Return Levels
97 years, 1897 to 2007A day with at least 55.8 mm (2.2 in) of rain is expected about once in 2 years. A day with at least 151.0 mm (5.9 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 55.8 mm (2.2 in) | |
| 5 years | 74.0 mm (2.9 in) | |
| 10 years | 88.6 mm (3.5 in) | |
| 25 years | 110.3 mm (4.3 in) | |
| 50 years | 129.3 mm (5.1 in) | |
| 100 years | 151.0 mm (5.9 in) | Longer than the 97 years of record |
The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 97 years of values from 1897 to 2007.
A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.
The largest wettest-day totals in the fit: 148.6 mm (5.9 in) in 1972; 140.0 mm (5.5 in) in 2004; 127.0 mm (5.0 in) in 1954.
Station Changes
1 suspectedOne change was suspected in the annual mean temperature of Derry 4 SW, at 1934. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1934 ran 0.3 C (0.5 F) higher than in the years before (likely change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 1934 | +0.3 | +0.5 | likely | 5 |
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Download the Data
Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-17 (17 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2025-12-31).