Irwin Weather Records (USC00364276)
Record envelope, standing records and threshold days for Irwin (USC00364276), Pennsylvania, United States, with 63 years of record.
Key Facts for Irwin
- Irwin (USC00364276) is a weather station in Pennsylvania, United States at 40.33 latitude and -79.70 longitude, 336 m (1,102 ft) above sea level.
- The station reports from 1896 to 1958, 63 years of record.
- 1,464 records set at Irwin still stand.
- Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
- Irwin set a daily record snowfall of 17.8 cm (7.0 in) on 14 March 1958.
About the Station
- Location: Pennsylvania, United States, 40.33 latitude, -79.70 longitude.
- Elevation: 336 m (1,102 ft).
- Period of record: 1896 to 1958, 63 years.
- Eligible elements: tmax, tmin, prcp, snow.
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 | 27.2 C (81.0 F) | -30.0 C (-22.0 F) | n/a | n/a |
| Feb | 24.4 C (75.9 F) | -27.2 C (-17.0 F) | n/a | n/a |
| Mar | 30.0 C (86.0 F) | -21.1 C (-6.0 F) | n/a | n/a |
| Apr | 33.3 C (91.9 F) | -18.3 C (-0.9 F) | n/a | n/a |
| May | 37.2 C (99.0 F) | -6.1 C (21.0 F) | n/a | n/a |
| Jun | 36.7 C (98.1 F) | 0.6 C (33.1 F) | n/a | n/a |
| Jul | 40.0 C (104.0 F) | 3.3 C (37.9 F) | n/a | n/a |
| Aug | 39.4 C (102.9 F) | 0.0 C (32.0 F) | n/a | n/a |
| Sep | 38.9 C (102.0 F) | -4.4 C (24.1 F) | n/a | n/a |
| Oct | 35.0 C (95.0 F) | -7.8 C (18.0 F) | n/a | n/a |
| Nov | 27.8 C (82.0 F) | -16.1 C (3.0 F) | n/a | n/a |
| Dec | 23.3 C (73.9 F) | -26.1 C (-15.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1896 | 16 |
| 1897 | 13 |
| 1900 | 100 |
| 1901 | 36 |
| 1902 | 28 |
| 1903 | 24 |
| 1904 | 29 |
| 1905 | 13 |
| 1906 | 30 |
| 1907 | 29 |
| 1908 | 32 |
| 1909 | 18 |
| 1910 | 31 |
| 1911 | 28 |
| 1912 | 23 |
| 1913 | 12 |
| 1914 | 40 |
| 1915 | 15 |
| 1916 | 16 |
| 1917 | 37 |
| 1918 | 46 |
| 1919 | 21 |
| 1920 | 34 |
| 1921 | 17 |
| 1922 | 14 |
| 1923 | 28 |
| 1924 | 22 |
| 1925 | 28 |
| 1926 | 28 |
| 1927 | 36 |
| 1928 | 29 |
| 1929 | 33 |
| 1930 | 35 |
| 1931 | 18 |
| 1932 | 25 |
| 1933 | 24 |
| 1934 | 21 |
| 1935 | 16 |
| 1936 | 42 |
| 1937 | 15 |
| 1938 | 15 |
| 1939 | 22 |
| 1940 | 27 |
| 1941 | 17 |
| 1942 | 22 |
| 1943 | 24 |
| 1944 | 8 |
| 1945 | 27 |
| 1946 | 22 |
| 1947 | 16 |
| 1948 | 14 |
| 1949 | 21 |
| 1950 | 25 |
| 1951 | 20 |
| 1952 | 16 |
| 1953 | 15 |
| 1954 | 20 |
| 1955 | 9 |
| 1956 | 10 |
| 1957 | 10 |
| 1958 | 2 |
All-Time Record Progression
1 new records| Date | Kind | Detail |
|---|---|---|
| 1950-11-25 | Record daily snowfall | Record daily snowfall 50.8 cm (20.0 in) |
Wettest Day of Each Month
Jul: 96.3 mm (3.8 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 39.6 mm (1.6 in) | 27 January 1952 |
| Feb | 45.5 mm (1.8 in) | 1 February 1951 |
| Mar | 61.0 mm (2.4 in) | 6 March 1945 |
| Apr | 59.9 mm (2.4 in) | 9 April 1942 |
| May | 44.7 mm (1.8 in) | 8 May 1931 |
| Jun | 87.6 mm (3.4 in) | 26 June 1921 |
| Jul | 96.3 mm (3.8 in) | 18 July 1912 |
| Aug | 73.7 mm (2.9 in) | 5 August 1956 |
| Sep | 64.8 mm (2.6 in) | 29 September 1936 |
| Oct | 73.7 mm (2.9 in) | 15 October 1954 |
| Nov | 67.3 mm (2.6 in) | 4 November 1950 |
| Dec | 63.5 mm (2.5 in) | 30 December 1942 |
Period of Record Coverage
1896 to 1958| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1896 | 115 | 31% | No |
| 1897 | 105 | 29% | No |
| 1900 | 260 | 71% | No |
| 1901 | 310 | 85% | No |
| 1902 | 327 | 90% | No |
| 1903 | 361 | 99% | Yes |
| 1904 | 349 | 95% | Yes |
| 1905 | 359 | 98% | Yes |
| 1906 | 365 | 100% | Yes |
| 1907 | 363 | 99% | Yes |
| 1908 | 358 | 98% | Yes |
| 1909 | 364 | 100% | Yes |
| 1910 | 341 | 93% | Yes |
| 1911 | 357 | 98% | Yes |
| 1912 | 357 | 98% | Yes |
| 1913 | 241 | 66% | No |
| 1914 | 325 | 89% | No |
| 1915 | 335 | 92% | Yes |
| 1916 | 356 | 97% | Yes |
| 1917 | 363 | 99% | Yes |
| 1918 | 361 | 99% | Yes |
| 1919 | 364 | 100% | Yes |
| 1920 | 357 | 98% | Yes |
| 1921 | 335 | 92% | Yes |
| 1922 | 313 | 86% | No |
| 1923 | 299 | 82% | No |
| 1924 | 357 | 98% | Yes |
| 1925 | 364 | 100% | Yes |
| 1926 | 365 | 100% | Yes |
| 1927 | 364 | 100% | Yes |
| 1928 | 366 | 100% | Yes |
| 1929 | 362 | 99% | Yes |
| 1930 | 365 | 100% | Yes |
| 1931 | 365 | 100% | Yes |
| 1932 | 359 | 98% | Yes |
| 1933 | 361 | 99% | Yes |
| 1934 | 361 | 99% | Yes |
| 1935 | 365 | 100% | Yes |
| 1936 | 366 | 100% | Yes |
| 1937 | 326 | 89% | No |
| 1938 | 365 | 100% | Yes |
| 1939 | 357 | 98% | Yes |
| 1940 | 361 | 99% | Yes |
| 1941 | 364 | 100% | Yes |
| 1942 | 362 | 99% | Yes |
| 1943 | 363 | 99% | Yes |
| 1944 | 366 | 100% | Yes |
| 1945 | 364 | 100% | Yes |
| 1946 | 363 | 99% | Yes |
| 1947 | 361 | 99% | Yes |
| 1948 | 335 | 92% | Yes |
| 1949 | 364 | 100% | Yes |
| 1950 | 364 | 100% | Yes |
| 1951 | 362 | 99% | Yes |
| 1952 | 361 | 99% | Yes |
| 1953 | 365 | 100% | Yes |
| 1954 | 338 | 93% | Yes |
| 1955 | 324 | 89% | No |
| 1956 | 313 | 86% | No |
| 1957 | 239 | 65% | No |
| 1958 | 59 | 16% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 14 March 1958 | Irwin, US | daily snowfall | 17.8 cm (7.0 in) | 7.6 cm (3.0 in) | 20 years | 25 of 100 (Routine) |
| 17 February 1958 | Irwin, US | daily low max | -11.1 C (12.0 F) | 2.8 C (5.0 F) | 54 years | 26 of 100 (Routine) |
| 17 February 1958 | Irwin, US | daily low min (Tie) | -21.7 C (-7.1 F) | tie | 54 years | 5 of 100 (Routine) |
| 14 February 1958 | Irwin, US | daily low max | -3.9 C (25.0 F) | 1.1 C (2.0 F) | 52 years | 22 of 100 (Routine) |
| 14 January 1958 | Irwin, US | daily rain | 29.0 mm (1.1 in) | 2.1 mm (0.08 in) | 51 years | 24 of 100 (Routine) |
| 8 January 1958 | Irwin, US | daily snowfall | 10.2 cm (4.0 in) | 1.8 cm (0.7 in) | 52 years | 25 of 100 (Routine) |
| 26 December 1957 | Irwin, US | daily rain | 22.4 mm (0.9 in) | 3.3 mm (0.13 in) | 14 years | 14 of 100 (Routine) |
| 20 December 1957 | Irwin, US | daily high min | 11.1 C (52.0 F) | 6.7 C (12.1 F) | 0 years | 16 of 100 (Routine) |
| 9 December 1957 | Irwin, US | daily rain | 22.4 mm (0.9 in) | 7.7 mm (0.30 in) | 38 years | 20 of 100 (Routine) |
| 5 December 1957 | Irwin, US | daily low min | -12.2 C (10.0 F) | 0.5 C (0.9 F) | 56 years | 22 of 100 (Routine) |
| 9 July 1957 | Irwin, US | daily rain | 40.9 mm (1.6 in) | 7.4 mm (0.29 in) | 28 years | 20 of 100 (Routine) |
| 3 July 1957 | Irwin, US | daily low min | 6.7 C (44.1 F) | 0.5 C (0.9 F) | 28 years | 15 of 100 (Routine) |
| 18 June 1957 | Irwin, US | daily high max (Tie) | 34.4 C (93.9 F) | tie | 4 years | 1 of 100 (Routine) |
| 6 May 1957 | Irwin, US | daily low min | -2.2 C (28.0 F) | 0.5 C (0.9 F) | 47 years | 20 of 100 (Routine) |
| 27 April 1957 | Irwin, US | daily high max (Tie) | 31.1 C (88.0 F) | tie | 42 years | 4 of 100 (Routine) |
| 25 April 1957 | Irwin, US | daily high min | 17.2 C (63.0 F) | 1.1 C (2.0 F) | 36 years | 17 of 100 (Routine) |
| 4 April 1957 | Irwin, US | daily rain | 30.7 mm (1.2 in) | 9.1 mm (0.36 in) | 23 years | 23 of 100 (Routine) |
| 2 April 1957 | Irwin, US | daily rain | 31.5 mm (1.2 in) | 15.0 mm (0.6 in) | 8 years | 27 of 100 (Routine) |
| 27 March 1957 | Irwin, US | daily rain | 18.3 mm (0.7 in) | 0.5 mm (0.02 in) | 35 years | 16 of 100 (Routine) |
| 12 March 1957 | Irwin, US | daily high min | 10.6 C (51.1 F) | 0.6 C (1.1 F) | 55 years | 23 of 100 (Routine) |
Climate Trend
45 complete years, 1903 to 1955| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1903 | 10.9 C | -0.02 C |
| 1904 | 10.2 C | -0.70 C |
| 1905 | 11.0 C | +0.12 C |
| 1906 | 12.0 C | +1.15 C |
| 1907 | 10.7 C | -0.16 C |
| 1908 | 11.9 C | +1.07 C |
| 1909 | 11.2 C | +0.31 C |
| 1910 | 10.5 C | -0.37 C |
| 1911 | 12.2 C | +1.33 C |
| 1912 | 10.7 C | -0.20 C |
| 1916 | 10.7 C | -0.15 C |
| 1917 | 8.9 C | -1.97 C |
| 1918 | 9.7 C | -1.14 C |
| 1919 | 10.7 C | -0.16 C |
| 1920 | 9.4 C | -1.49 C |
| 1924 | 9.1 C | -1.78 C |
| 1925 | 10.7 C | -0.20 C |
| 1926 | 9.7 C | -1.20 C |
| 1927 | 10.0 C | -0.83 C |
| 1928 | 9.3 C | -1.58 C |
| 1929 | 9.4 C | -1.49 C |
| 1930 | 10.2 C | -0.67 C |
| 1931 | 11.1 C | +0.20 C |
| 1932 | 11.4 C | +0.50 C |
| 1933 | 11.8 C | +0.92 C |
| 1934 | 11.1 C | +0.27 C |
| 1935 | 10.5 C | -0.37 C |
| 1936 | 10.6 C | -0.23 C |
| 1938 | 11.7 C | +0.85 C |
| 1939 | 11.8 C | +0.91 C |
| 1940 | 10.1 C | -0.77 C |
| 1941 | 11.3 C | +0.42 C |
| 1942 | 10.9 C | +0.06 C |
| 1943 | 10.2 C | -0.70 C |
| 1944 | 11.2 C | +0.29 C |
| 1945 | 11.2 C | +0.33 C |
| 1946 | 12.9 C | +2.00 C |
| 1947 | 10.8 C | -0.08 C |
| 1949 | 12.4 C | +1.48 C |
| 1950 | 10.6 C | -0.29 C |
| 1951 | 11.3 C | +0.39 C |
| 1952 | 11.9 C | +0.98 C |
| 1953 | 12.2 C | +1.35 C |
| 1954 | 11.7 C | +0.83 C |
| 1955 | 11.7 C | +0.79 C |
The annual mean temperature here has risen by 0.18 C (0.01 to 0.35) per decade over 1903 to 1955. In Fahrenheit: 0.32 F (0.01 to 0.63) per decade. The slope is a straight line fitted to 45 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.18 C (0.01 to 0.35) per decade | 0.32 F (0.01 to 0.63) per decade | 1903 to 1955 | 45 | Rise |
| Mean daily maximum | 0.1 C (-0.1 to 0.4) per decade | 0.2 F (-0.2 to 0.7) per decade | 1903 to 1955 | 45 | Not clearly different from zero |
| Mean daily minimum | 0.2 C (0.1 to 0.4) per decade | 0.4 F (0.2 to 0.7) per decade | 1903 to 1955 | 45 | Rise |
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 1958| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 40.0 C (104.0 F) | 1911 | 35.6 C (96.1 F) | 61 |
| Coldest night (TNn) | -30.0 C (-22.0 F) | 1912 | -20.6 C (-5.1 F) | 61 |
| Wettest day (Rx1day) | 96.3 mm (3.8 in) | 1912 | 50.8 mm (2.0 in) | 63 |
| Wettest five days (Rx5day) | 159.0 mm (6.3 in) | 1921 | 78.0 mm (3.1 in) | 63 |
| Longest dry spell (CDD) | 37 days | 1897 | 16 days | 63 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1896 | 36.7 C (98.1 F) |
| 1897 | 32.2 C (90.0 F) |
| 1898 | n/a |
| 1899 | n/a |
| 1900 | 37.8 C (100.0 F) |
| 1901 | 36.7 C (98.1 F) |
| 1902 | 35.6 C (96.1 F) |
| 1903 | 37.2 C (99.0 F) |
| 1904 | 35.6 C (96.1 F) |
| 1905 | 35.6 C (96.1 F) |
| 1906 | 37.2 C (99.0 F) |
| 1907 | 33.9 C (93.0 F) |
| 1908 | 37.2 C (99.0 F) |
| 1909 | 33.9 C (93.0 F) |
| 1910 | 35.6 C (96.1 F) |
| 1911 | 40.0 C (104.0 F) |
| 1912 | 33.3 C (91.9 F) |
| 1913 | 35.0 C (95.0 F) |
| 1914 | 35.6 C (96.1 F) |
| 1915 | 33.9 C (93.0 F) |
| 1916 | 35.6 C (96.1 F) |
| 1917 | 35.0 C (95.0 F) |
| 1918 | 39.4 C (102.9 F) |
| 1919 | 35.0 C (95.0 F) |
| 1920 | 30.0 C (86.0 F) |
| 1921 | 34.4 C (93.9 F) |
| 1922 | 35.0 C (95.0 F) |
| 1923 | 32.8 C (91.0 F) |
| 1924 | 35.6 C (96.1 F) |
| 1925 | 36.1 C (97.0 F) |
| 1926 | 38.9 C (102.0 F) |
| 1927 | 35.0 C (95.0 F) |
| 1928 | 33.9 C (93.0 F) |
| 1929 | 33.9 C (93.0 F) |
| 1930 | 37.8 C (100.0 F) |
| 1931 | 36.7 C (98.1 F) |
| 1932 | 36.1 C (97.0 F) |
| 1933 | 36.1 C (97.0 F) |
| 1934 | 36.7 C (98.1 F) |
| 1935 | 33.3 C (91.9 F) |
| 1936 | 38.9 C (102.0 F) |
| 1937 | 35.0 C (95.0 F) |
| 1938 | 34.4 C (93.9 F) |
| 1939 | 36.7 C (98.1 F) |
| 1940 | 34.4 C (93.9 F) |
| 1941 | 35.0 C (95.0 F) |
| 1942 | 36.1 C (97.0 F) |
| 1943 | 34.4 C (93.9 F) |
| 1944 | 35.6 C (96.1 F) |
| 1945 | 33.9 C (93.0 F) |
| 1946 | 34.4 C (93.9 F) |
| 1947 | 33.3 C (91.9 F) |
| 1948 | 37.2 C (99.0 F) |
| 1949 | 35.6 C (96.1 F) |
| 1950 | 33.3 C (91.9 F) |
| 1951 | 34.4 C (93.9 F) |
| 1952 | 35.6 C (96.1 F) |
| 1953 | 38.9 C (102.0 F) |
| 1954 | 36.1 C (97.0 F) |
| 1955 | 37.2 C (99.0 F) |
| 1956 | 33.9 C (93.0 F) |
| 1957 | 34.4 C (93.9 F) |
| 1958 | 15.0 C (59.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1896 | -11.1 C (12.0 F) |
| 1897 | -20.0 C (-4.0 F) |
| 1898 | n/a |
| 1899 | n/a |
| 1900 | -12.2 C (10.0 F) |
| 1901 | -22.8 C (-9.0 F) |
| 1902 | -20.0 C (-4.0 F) |
| 1903 | -20.6 C (-5.1 F) |
| 1904 | -27.2 C (-17.0 F) |
| 1905 | -24.4 C (-11.9 F) |
| 1906 | -21.1 C (-6.0 F) |
| 1907 | -25.6 C (-14.1 F) |
| 1908 | -19.4 C (-2.9 F) |
| 1909 | -18.9 C (-2.0 F) |
| 1910 | -20.0 C (-4.0 F) |
| 1911 | -15.6 C (3.9 F) |
| 1912 | -30.0 C (-22.0 F) |
| 1913 | -16.1 C (3.0 F) |
| 1914 | -22.2 C (-8.0 F) |
| 1915 | -18.9 C (-2.0 F) |
| 1916 | -25.6 C (-14.1 F) |
| 1917 | -26.1 C (-15.0 F) |
| 1918 | -26.7 C (-16.1 F) |
| 1919 | -23.3 C (-9.9 F) |
| 1920 | -18.9 C (-2.0 F) |
| 1921 | -14.4 C (6.1 F) |
| 1922 | -16.7 C (1.9 F) |
| 1923 | -20.0 C (-4.0 F) |
| 1924 | -19.4 C (-2.9 F) |
| 1925 | -25.0 C (-13.0 F) |
| 1926 | -22.8 C (-9.0 F) |
| 1927 | -18.9 C (-2.0 F) |
| 1928 | -19.4 C (-2.9 F) |
| 1929 | -22.8 C (-9.0 F) |
| 1930 | -20.6 C (-5.1 F) |
| 1931 | -12.8 C (9.0 F) |
| 1932 | -21.1 C (-6.0 F) |
| 1933 | -20.6 C (-5.1 F) |
| 1934 | -27.2 C (-17.0 F) |
| 1935 | -20.6 C (-5.1 F) |
| 1936 | -26.1 C (-15.0 F) |
| 1937 | -17.8 C (0.0 F) |
| 1938 | -16.1 C (3.0 F) |
| 1939 | -16.7 C (1.9 F) |
| 1940 | -22.8 C (-9.0 F) |
| 1941 | -17.8 C (0.0 F) |
| 1942 | -25.6 C (-14.1 F) |
| 1943 | -23.3 C (-9.9 F) |
| 1944 | -22.2 C (-8.0 F) |
| 1945 | -22.8 C (-9.0 F) |
| 1946 | -20.0 C (-4.0 F) |
| 1947 | -17.8 C (0.0 F) |
| 1948 | -24.4 C (-11.9 F) |
| 1949 | -16.1 C (3.0 F) |
| 1950 | -22.2 C (-8.0 F) |
| 1951 | -22.2 C (-8.0 F) |
| 1952 | -16.1 C (3.0 F) |
| 1953 | -12.8 C (9.0 F) |
| 1954 | -16.7 C (1.9 F) |
| 1955 | -23.9 C (-11.0 F) |
| 1956 | -15.6 C (3.9 F) |
| 1957 | -21.7 C (-7.1 F) |
| 1958 | -21.7 C (-7.1 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1896 | 50.3 mm (2.0 in) |
| 1897 | 48.8 mm (1.9 in) |
| 1898 | 55.4 mm (2.2 in) |
| 1899 | 41.9 mm (1.6 in) |
| 1900 | 47.2 mm (1.9 in) |
| 1901 | 57.7 mm (2.3 in) |
| 1902 | 63.5 mm (2.5 in) |
| 1903 | 94.7 mm (3.7 in) |
| 1904 | 44.5 mm (1.8 in) |
| 1905 | 53.3 mm (2.1 in) |
| 1906 | 50.8 mm (2.0 in) |
| 1907 | 50.8 mm (2.0 in) |
| 1908 | 38.1 mm (1.5 in) |
| 1909 | 40.4 mm (1.6 in) |
| 1910 | 31.0 mm (1.2 in) |
| 1911 | 57.2 mm (2.3 in) |
| 1912 | 96.3 mm (3.8 in) |
| 1913 | 40.4 mm (1.6 in) |
| 1914 | 50.0 mm (2.0 in) |
| 1915 | 34.3 mm (1.4 in) |
| 1916 | 34.8 mm (1.4 in) |
| 1917 | 39.6 mm (1.6 in) |
| 1918 | 50.8 mm (2.0 in) |
| 1919 | 58.9 mm (2.3 in) |
| 1920 | 44.7 mm (1.8 in) |
| 1921 | 87.6 mm (3.4 in) |
| 1922 | 55.9 mm (2.2 in) |
| 1923 | 41.1 mm (1.6 in) |
| 1924 | 70.4 mm (2.8 in) |
| 1925 | 35.1 mm (1.4 in) |
| 1926 | 48.3 mm (1.9 in) |
| 1927 | 50.8 mm (2.0 in) |
| 1928 | 35.6 mm (1.4 in) |
| 1929 | 50.8 mm (2.0 in) |
| 1930 | 35.6 mm (1.4 in) |
| 1931 | 45.7 mm (1.8 in) |
| 1932 | 35.8 mm (1.4 in) |
| 1933 | 38.1 mm (1.5 in) |
| 1934 | 50.8 mm (2.0 in) |
| 1935 | 38.1 mm (1.5 in) |
| 1936 | 64.8 mm (2.6 in) |
| 1937 | 47.2 mm (1.9 in) |
| 1938 | 51.6 mm (2.0 in) |
| 1939 | 31.0 mm (1.2 in) |
| 1940 | 56.6 mm (2.2 in) |
| 1941 | 49.8 mm (2.0 in) |
| 1942 | 63.5 mm (2.5 in) |
| 1943 | 51.8 mm (2.0 in) |
| 1944 | 44.5 mm (1.8 in) |
| 1945 | 61.0 mm (2.4 in) |
| 1946 | 45.7 mm (1.8 in) |
| 1947 | 54.6 mm (2.1 in) |
| 1948 | 50.8 mm (2.0 in) |
| 1949 | 53.1 mm (2.1 in) |
| 1950 | 78.2 mm (3.1 in) |
| 1951 | 56.4 mm (2.2 in) |
| 1952 | 63.5 mm (2.5 in) |
| 1953 | 54.1 mm (2.1 in) |
| 1954 | 73.7 mm (2.9 in) |
| 1955 | 67.3 mm (2.6 in) |
| 1956 | 73.7 mm (2.9 in) |
| 1957 | 40.9 mm (1.6 in) |
| 1958 | 29.0 mm (1.1 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1896 | 57.4 mm (2.3 in) |
| 1897 | 55.4 mm (2.2 in) |
| 1898 | 89.0 mm (3.5 in) |
| 1899 | 60.8 mm (2.4 in) |
| 1900 | 51.6 mm (2.0 in) |
| 1901 | 47.5 mm (1.9 in) |
| 1902 | 80.3 mm (3.2 in) |
| 1903 | 112.4 mm (4.4 in) |
| 1904 | 75.8 mm (3.0 in) |
| 1905 | 65.4 mm (2.6 in) |
| 1906 | 92.9 mm (3.7 in) |
| 1907 | 89.9 mm (3.5 in) |
| 1908 | 50.5 mm (2.0 in) |
| 1909 | 51.3 mm (2.0 in) |
| 1910 | 50.3 mm (2.0 in) |
| 1911 | 97.0 mm (3.8 in) |
| 1912 | 152.9 mm (6.0 in) |
| 1913 | 62.5 mm (2.5 in) |
| 1914 | 83.9 mm (3.3 in) |
| 1915 | 78.0 mm (3.1 in) |
| 1916 | 56.6 mm (2.2 in) |
| 1917 | 68.6 mm (2.7 in) |
| 1918 | 95.1 mm (3.7 in) |
| 1919 | 65.5 mm (2.6 in) |
| 1920 | 73.4 mm (2.9 in) |
| 1921 | 159.0 mm (6.3 in) |
| 1922 | 80.8 mm (3.2 in) |
| 1923 | 80.0 mm (3.1 in) |
| 1924 | 79.6 mm (3.1 in) |
| 1925 | 45.3 mm (1.8 in) |
| 1926 | 121.7 mm (4.8 in) |
| 1927 | 67.3 mm (2.6 in) |
| 1928 | 76.3 mm (3.0 in) |
| 1929 | 58.9 mm (2.3 in) |
| 1930 | 50.1 mm (2.0 in) |
| 1931 | 63.7 mm (2.5 in) |
| 1932 | 39.1 mm (1.5 in) |
| 1933 | 67.1 mm (2.6 in) |
| 1934 | 96.1 mm (3.8 in) |
| 1935 | 83.0 mm (3.3 in) |
| 1936 | 110.2 mm (4.3 in) |
| 1937 | 103.6 mm (4.1 in) |
| 1938 | 86.6 mm (3.4 in) |
| 1939 | 75.1 mm (3.0 in) |
| 1940 | 82.2 mm (3.2 in) |
| 1941 | 87.4 mm (3.4 in) |
| 1942 | 98.1 mm (3.9 in) |
| 1943 | 100.2 mm (3.9 in) |
| 1944 | 65.9 mm (2.6 in) |
| 1945 | 108.5 mm (4.3 in) |
| 1946 | 67.5 mm (2.7 in) |
| 1947 | 77.5 mm (3.1 in) |
| 1948 | 111.0 mm (4.4 in) |
| 1949 | 79.8 mm (3.1 in) |
| 1950 | 82.5 mm (3.2 in) |
| 1951 | 110.5 mm (4.4 in) |
| 1952 | 76.7 mm (3.0 in) |
| 1953 | 68.6 mm (2.7 in) |
| 1954 | 108.8 mm (4.3 in) |
| 1955 | 93.7 mm (3.7 in) |
| 1956 | 122.0 mm (4.8 in) |
| 1957 | 68.1 mm (2.7 in) |
| 1958 | 37.6 mm (1.5 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1896 | 9 days |
| 1897 | 37 days |
| 1898 | 10 days |
| 1899 | 14 days |
| 1900 | 22 days |
| 1901 | 11 days |
| 1902 | 23 days |
| 1903 | 19 days |
| 1904 | 14 days |
| 1905 | 12 days |
| 1906 | 16 days |
| 1907 | 10 days |
| 1908 | 19 days |
| 1909 | 16 days |
| 1910 | 14 days |
| 1911 | 11 days |
| 1912 | 17 days |
| 1913 | 14 days |
| 1914 | 20 days |
| 1915 | 18 days |
| 1916 | 11 days |
| 1917 | 22 days |
| 1918 | 17 days |
| 1919 | 13 days |
| 1920 | 23 days |
| 1921 | 16 days |
| 1922 | 33 days |
| 1923 | 15 days |
| 1924 | 23 days |
| 1925 | 19 days |
| 1926 | 19 days |
| 1927 | 12 days |
| 1928 | 12 days |
| 1929 | 15 days |
| 1930 | 29 days |
| 1931 | 10 days |
| 1932 | 16 days |
| 1933 | 17 days |
| 1934 | 21 days |
| 1935 | 12 days |
| 1936 | 12 days |
| 1937 | 13 days |
| 1938 | 13 days |
| 1939 | 25 days |
| 1940 | 13 days |
| 1941 | 19 days |
| 1942 | 17 days |
| 1943 | 26 days |
| 1944 | 16 days |
| 1945 | 13 days |
| 1946 | 13 days |
| 1947 | 26 days |
| 1948 | 16 days |
| 1949 | 15 days |
| 1950 | 13 days |
| 1951 | 19 days |
| 1952 | 24 days |
| 1953 | 24 days |
| 1954 | 14 days |
| 1955 | 21 days |
| 1956 | 13 days |
| 1957 | 26 days |
| 1958 | 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
45 years with a frostAcross 45 years with a frost, the median last spring frost at Irwin falls on 10 May and the median first autumn frost on 7 October, which leaves a median of 152 days between them.
Fitted over all years, the growing season changes by +3.4 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1924 to 1955) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 10 May | n/a | 11 May | n/a | -0.6 days per decade |
| First autumn frost | 7 October | n/a | 8 October | n/a | +2.7 days per decade |
| Growing days | 152 days | n/a | 153 days | n/a | +3.4 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
54 years, 1897 to 1957A day with at least 49.5 mm (1.9 in) of rain is expected about once in 2 years. A day with at least 95.2 mm (3.7 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 49.5 mm (1.9 in) | |
| 5 years | 62.0 mm (2.4 in) | |
| 10 years | 70.1 mm (2.8 in) | |
| 25 years | 80.3 mm (3.2 in) | |
| 50 years | 87.8 mm (3.5 in) | |
| 100 years | 95.2 mm (3.7 in) | Longer than the 54 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, 54 years of values from 1897 to 1957.
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: 96.3 mm (3.8 in) in 1912; 87.6 mm (3.4 in) in 1921; 78.2 mm (3.1 in) in 1950.
Station Changes
1 suspectedOne change was suspected in the annual mean temperature of Irwin, at 1932. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1932 ran 0.6 C (1.2 F) higher than in the years before (likely change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 1932 | +0.6 | +1.2 | 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).