Yonna Weather Records (USC00359604)
Record envelope, standing records and threshold days for Yonna (USC00359604), Oregon, United States, with 45 years of record.
Key Facts for Yonna
- Yonna (USC00359604) is a weather station in Oregon, United States at 42.30 latitude and -121.48 longitude, 1,275 m (4,183 ft) above sea level.
- The station reports from 1905 to 1949, 45 years of record.
- 1,464 records set at Yonna still stand.
- Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
- Yonna set a daily record low minimum temperature of -22.8 C (-9.0 F) on 28 January 1949.
About the Station
- Location: Oregon, United States, 42.30 latitude, -121.48 longitude.
- Elevation: 1,275 m (4,183 ft).
- Period of record: 1905 to 1949, 45 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 | 16.7 C (62.1 F) | -34.4 C (-29.9 F) | n/a | n/a |
| Feb | 21.1 C (70.0 F) | -30.0 C (-22.0 F) | n/a | n/a |
| Mar | 24.4 C (75.9 F) | -30.6 C (-23.1 F) | n/a | n/a |
| Apr | 29.4 C (84.9 F) | -14.4 C (6.1 F) | n/a | n/a |
| May | 36.7 C (98.1 F) | -10.0 C (14.0 F) | n/a | n/a |
| Jun | 39.4 C (102.9 F) | -7.2 C (19.0 F) | n/a | n/a |
| Jul | 39.4 C (102.9 F) | -5.0 C (23.0 F) | n/a | n/a |
| Aug | 39.4 C (102.9 F) | -7.2 C (19.0 F) | n/a | n/a |
| Sep | 35.6 C (96.1 F) | -12.2 C (10.0 F) | n/a | n/a |
| Oct | 32.2 C (90.0 F) | -15.0 C (5.0 F) | n/a | n/a |
| Nov | 25.0 C (77.0 F) | -23.3 C (-9.9 F) | n/a | n/a |
| Dec | 18.3 C (64.9 F) | -33.9 C (-29.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1905 | 1 |
| 1906 | 23 |
| 1907 | 31 |
| 1908 | 47 |
| 1909 | 34 |
| 1910 | 34 |
| 1911 | 35 |
| 1912 | 47 |
| 1913 | 64 |
| 1914 | 38 |
| 1915 | 38 |
| 1916 | 65 |
| 1917 | 87 |
| 1918 | 38 |
| 1919 | 44 |
| 1920 | 47 |
| 1921 | 22 |
| 1922 | 32 |
| 1923 | 18 |
| 1924 | 19 |
| 1925 | 41 |
| 1926 | 43 |
| 1927 | 26 |
| 1928 | 29 |
| 1929 | 33 |
| 1930 | 25 |
| 1931 | 38 |
| 1932 | 42 |
| 1933 | 38 |
| 1934 | 39 |
| 1935 | 23 |
| 1936 | 15 |
| 1937 | 49 |
| 1938 | 39 |
| 1939 | 34 |
| 1940 | 38 |
| 1941 | 26 |
| 1942 | 18 |
| 1943 | 25 |
| 1944 | 11 |
| 1945 | 23 |
| 1946 | 8 |
| 1947 | 15 |
| 1948 | 14 |
| 1949 | 8 |
All-Time Record Progression
2 new records| Date | Kind | Detail |
|---|---|---|
| 1937-01-07 | Record low maximum temperature | Record low maximum temperature -17.8 C (0.0 F) |
| 1939-12-09 | Record daily precipitation | Record daily precipitation 69.6 mm (2.7 in) |
Wettest Day of Each Month
Dec: 69.6 mm (2.7 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 24.9 mm (1.0 in) | 5 January 1909 |
| Feb | 27.4 mm (1.1 in) | 27 February 1940 |
| Mar | 43.2 mm (1.7 in) | 26 March 1928 |
| Apr | 26.2 mm (1.0 in) | 7 April 1935 |
| May | 40.6 mm (1.6 in) | 19 May 1925 |
| Jun | 48.5 mm (1.9 in) | 20 June 1928 |
| Jul | 27.9 mm (1.1 in) | 6 July 1923 |
| Aug | 24.1 mm (0.9 in) | 24 August 1907 |
| Sep | 20.3 mm (0.8 in) | 18 September 1940 |
| Oct | 43.2 mm (1.7 in) | 6 October 1925 |
| Nov | 44.2 mm (1.7 in) | 24 November 1910 |
| Dec | 69.6 mm (2.7 in) | 9 December 1939 |
Period of Record Coverage
1906 to 1949| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1906 | 332 | 91% | Yes |
| 1907 | 363 | 99% | Yes |
| 1908 | 363 | 99% | Yes |
| 1909 | 363 | 99% | Yes |
| 1910 | 358 | 98% | Yes |
| 1911 | 360 | 99% | Yes |
| 1912 | 363 | 99% | Yes |
| 1913 | 362 | 99% | Yes |
| 1914 | 357 | 98% | Yes |
| 1915 | 275 | 75% | No |
| 1916 | 357 | 98% | Yes |
| 1917 | 357 | 98% | Yes |
| 1918 | 325 | 89% | No |
| 1919 | 362 | 99% | Yes |
| 1920 | 363 | 99% | Yes |
| 1921 | 361 | 99% | Yes |
| 1922 | 363 | 99% | Yes |
| 1923 | 222 | 61% | No |
| 1924 | 151 | 41% | No |
| 1925 | 361 | 99% | Yes |
| 1926 | 362 | 99% | Yes |
| 1927 | 353 | 97% | Yes |
| 1928 | 358 | 98% | Yes |
| 1929 | 364 | 100% | Yes |
| 1930 | 365 | 100% | Yes |
| 1931 | 353 | 97% | Yes |
| 1932 | 364 | 99% | Yes |
| 1933 | 360 | 99% | Yes |
| 1934 | 365 | 100% | Yes |
| 1935 | 356 | 98% | Yes |
| 1936 | 325 | 89% | No |
| 1937 | 359 | 98% | Yes |
| 1938 | 356 | 98% | Yes |
| 1939 | 358 | 98% | Yes |
| 1940 | 362 | 99% | Yes |
| 1941 | 362 | 99% | Yes |
| 1942 | 365 | 100% | Yes |
| 1943 | 363 | 99% | Yes |
| 1944 | 322 | 88% | No |
| 1945 | 320 | 88% | No |
| 1946 | 246 | 67% | No |
| 1947 | 240 | 66% | No |
| 1948 | 242 | 66% | No |
| 1949 | 31 | 8% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 28 January 1949 | Yonna, US | daily low min | -22.8 C (-9.0 F) | 1.7 C (3.1 F) | 36 years | 16 of 100 (Routine) |
| 26 January 1949 | Yonna, US | daily low min | -26.1 C (-15.0 F) | 4.4 C (7.9 F) | 32 years | 18 of 100 (Routine) |
| 24 January 1949 | Yonna, US | daily low min | -30.0 C (-22.0 F) | 10.0 C (18.0 F) | 32 years | 26 of 100 (Routine) |
| 23 January 1949 | Yonna, US | all-time low min (Tie) | -34.4 C (-29.9 F) | tie | 32 years | 8 of 100 (Routine) |
| 21 January 1949 | Yonna, US | daily snowfall | 7.6 cm (3.0 in) | 0.5 cm (0.2 in) | 35 years | 15 of 100 (Routine) |
| 10 January 1949 | Yonna, US | daily low max | -7.2 C (19.0 F) | 0.5 C (0.9 F) | 19 years | 10 of 100 (Routine) |
| 9 January 1949 | Yonna, US | daily low max (Tie) | -7.8 C (18.0 F) | tie | 12 years | 1 of 100 (Routine) |
| 5 January 1949 | Yonna, US | daily low min | -27.8 C (-18.0 F) | 2.2 C (4.0 F) | 30 years | 15 of 100 (Routine) |
| 4 January 1949 | Yonna, US | daily low min | -33.3 C (-27.9 F) | 1.6 C (2.9 F) | 37 years | 17 of 100 (Routine) |
| 3 January 1949 | Yonna, US | daily low min | -30.0 C (-22.0 F) | 0.6 C (1.1 F) | 37 years | 15 of 100 (Routine) |
| 1 January 1949 | Yonna, US | daily snowfall | 15.2 cm (6.0 in) | 7.6 cm (3.0 in) | 33 years | 29 of 100 (Routine) |
| 24 December 1948 | Yonna, US | daily low min | -29.4 C (-20.9 F) | 4.4 C (7.9 F) | 24 years | 17 of 100 (Routine) |
| 23 December 1948 | Yonna, US | daily low min | -26.1 C (-15.0 F) | 4.4 C (7.9 F) | 30 years | 19 of 100 (Routine) |
| 22 December 1948 | Yonna, US | daily low min | -28.9 C (-20.0 F) | 8.9 C (16.0 F) | 37 years | 28 of 100 (Routine) |
| 21 December 1948 | Yonna, US | daily low min | -24.4 C (-11.9 F) | 1.1 C (2.0 F) | 34 years | 15 of 100 (Routine) |
| 6 December 1948 | Yonna, US | daily snowfall | 5.1 cm (2.0 in) | 2.6 cm (1.0 in) | 32 years | 19 of 100 (Routine) |
| 6 December 1948 | Yonna, US | daily low max (Tie) | -1.1 C (30.0 F) | tie | 32 years | 3 of 100 (Routine) |
| 4 December 1948 | Yonna, US | daily low min | -21.7 C (-7.1 F) | 6.1 C (11.0 F) | 39 years | 24 of 100 (Routine) |
| 4 December 1948 | Yonna, US | daily snowfall | 7.6 cm (3.0 in) | 2.5 cm (1.0 in) | 28 years | 18 of 100 (Routine) |
| 2 December 1948 | Yonna, US | daily snowfall | 11.4 cm (4.5 in) | 6.3 cm (2.5 in) | 34 years | 29 of 100 (Routine) |
Climate Trend
29 complete years, 1909 to 1943| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1909 | 7.2 C | -0.40 C |
| 1910 | 7.4 C | -0.29 C |
| 1912 | 6.5 C | -1.11 C |
| 1913 | 5.4 C | -2.29 C |
| 1914 | 6.8 C | -0.88 C |
| 1916 | 5.6 C | -2.05 C |
| 1917 | 5.3 C | -2.38 C |
| 1919 | 6.4 C | -1.20 C |
| 1920 | 6.7 C | -0.91 C |
| 1921 | 7.0 C | -0.61 C |
| 1922 | 5.4 C | -2.26 C |
| 1925 | 9.1 C | +1.48 C |
| 1926 | 9.9 C | +2.23 C |
| 1927 | 8.2 C | +0.53 C |
| 1928 | 8.8 C | +1.18 C |
| 1929 | 8.7 C | +1.05 C |
| 1930 | 8.5 C | +0.87 C |
| 1931 | 9.4 C | +1.75 C |
| 1932 | 8.0 C | +0.33 C |
| 1933 | 8.0 C | +0.35 C |
| 1934 | 9.7 C | +2.02 C |
| 1935 | 7.5 C | -0.19 C |
| 1937 | 6.0 C | -1.66 C |
| 1938 | 6.7 C | -0.99 C |
| 1939 | 8.0 C | +0.34 C |
| 1940 | 9.8 C | +2.17 C |
| 1941 | 9.0 C | +1.33 C |
| 1942 | 8.3 C | +0.63 C |
| 1943 | 8.6 C | +0.99 C |
This station does not have enough complete years (30 are needed) to fit a temperature trend.
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
1905 to 1949| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 39.4 C (102.9 F) | 1925 | 36.7 C (98.1 F) | 44 |
| Coldest night (TNn) | -34.4 C (-29.9 F) | 1917 | -24.4 C (-11.9 F) | 45 |
| Wettest day (Rx1day) | 69.6 mm (2.7 in) | 1939 | 22.4 mm (0.9 in) | 43 |
| Wettest five days (Rx5day) | 99.6 mm (3.9 in) | 1939 | 45.5 mm (1.8 in) | 43 |
| Longest dry spell (CDD) | 146 days | 1926 | 48 days | 43 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1905 | n/a |
| 1906 | 36.7 C (98.1 F) |
| 1907 | 32.2 C (90.0 F) |
| 1908 | 38.3 C (100.9 F) |
| 1909 | 35.0 C (95.0 F) |
| 1910 | 36.7 C (98.1 F) |
| 1911 | 35.6 C (96.1 F) |
| 1912 | 33.9 C (93.0 F) |
| 1913 | 36.7 C (98.1 F) |
| 1914 | 35.6 C (96.1 F) |
| 1915 | 36.1 C (97.0 F) |
| 1916 | 35.0 C (95.0 F) |
| 1917 | 36.7 C (98.1 F) |
| 1918 | 34.4 C (93.9 F) |
| 1919 | 36.7 C (98.1 F) |
| 1920 | 37.8 C (100.0 F) |
| 1921 | 36.1 C (97.0 F) |
| 1922 | 36.1 C (97.0 F) |
| 1923 | 35.6 C (96.1 F) |
| 1924 | 37.8 C (100.0 F) |
| 1925 | 39.4 C (102.9 F) |
| 1926 | 37.2 C (99.0 F) |
| 1927 | 34.4 C (93.9 F) |
| 1928 | 39.4 C (102.9 F) |
| 1929 | 38.3 C (100.9 F) |
| 1930 | 35.6 C (96.1 F) |
| 1931 | 38.9 C (102.0 F) |
| 1932 | 37.8 C (100.0 F) |
| 1933 | 38.9 C (102.0 F) |
| 1934 | 37.8 C (100.0 F) |
| 1935 | 37.8 C (100.0 F) |
| 1936 | 37.2 C (99.0 F) |
| 1937 | 35.0 C (95.0 F) |
| 1938 | 37.2 C (99.0 F) |
| 1939 | 39.4 C (102.9 F) |
| 1940 | 37.8 C (100.0 F) |
| 1941 | 36.1 C (97.0 F) |
| 1942 | 37.2 C (99.0 F) |
| 1943 | 35.6 C (96.1 F) |
| 1944 | 36.7 C (98.1 F) |
| 1945 | 36.1 C (97.0 F) |
| 1946 | 36.1 C (97.0 F) |
| 1947 | 37.2 C (99.0 F) |
| 1948 | 35.0 C (95.0 F) |
| 1949 | 6.1 C (43.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1905 | -22.2 C (-8.0 F) |
| 1906 | -26.7 C (-16.1 F) |
| 1907 | -23.3 C (-9.9 F) |
| 1908 | -27.8 C (-18.0 F) |
| 1909 | -23.3 C (-9.9 F) |
| 1910 | -24.4 C (-11.9 F) |
| 1911 | -27.8 C (-18.0 F) |
| 1912 | -31.7 C (-25.1 F) |
| 1913 | -27.8 C (-18.0 F) |
| 1914 | -26.7 C (-16.1 F) |
| 1915 | -18.9 C (-2.0 F) |
| 1916 | -26.1 C (-15.0 F) |
| 1917 | -34.4 C (-29.9 F) |
| 1918 | -27.2 C (-17.0 F) |
| 1919 | -33.9 C (-29.0 F) |
| 1920 | -23.9 C (-11.0 F) |
| 1921 | -25.0 C (-13.0 F) |
| 1922 | -32.8 C (-27.0 F) |
| 1923 | -30.0 C (-22.0 F) |
| 1924 | -25.0 C (-13.0 F) |
| 1925 | -12.8 C (9.0 F) |
| 1926 | -17.2 C (1.0 F) |
| 1927 | -17.2 C (1.0 F) |
| 1928 | -17.8 C (0.0 F) |
| 1929 | -19.4 C (-2.9 F) |
| 1930 | -25.6 C (-14.1 F) |
| 1931 | -20.6 C (-5.1 F) |
| 1932 | -26.7 C (-16.1 F) |
| 1933 | -26.7 C (-16.1 F) |
| 1934 | -13.9 C (7.0 F) |
| 1935 | -21.7 C (-7.1 F) |
| 1936 | -18.3 C (-0.9 F) |
| 1937 | -29.4 C (-20.9 F) |
| 1938 | -22.8 C (-9.0 F) |
| 1939 | -18.3 C (-0.9 F) |
| 1940 | -17.2 C (1.0 F) |
| 1941 | -12.8 C (9.0 F) |
| 1942 | -27.8 C (-18.0 F) |
| 1943 | -21.1 C (-6.0 F) |
| 1944 | -20.6 C (-5.1 F) |
| 1945 | -20.0 C (-4.0 F) |
| 1946 | -17.2 C (1.0 F) |
| 1947 | -28.3 C (-18.9 F) |
| 1948 | -29.4 C (-20.9 F) |
| 1949 | -34.4 C (-29.9 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1905 | n/a |
| 1906 | n/a |
| 1907 | 30.5 mm (1.2 in) |
| 1908 | 35.1 mm (1.4 in) |
| 1909 | 24.9 mm (1.0 in) |
| 1910 | 44.2 mm (1.7 in) |
| 1911 | 18.0 mm (0.7 in) |
| 1912 | 21.1 mm (0.8 in) |
| 1913 | 27.9 mm (1.1 in) |
| 1914 | 30.5 mm (1.2 in) |
| 1915 | 29.0 mm (1.1 in) |
| 1916 | 13.2 mm (0.5 in) |
| 1917 | 24.1 mm (0.9 in) |
| 1918 | 15.0 mm (0.6 in) |
| 1919 | 17.0 mm (0.7 in) |
| 1920 | 19.3 mm (0.8 in) |
| 1921 | 21.3 mm (0.8 in) |
| 1922 | 15.2 mm (0.6 in) |
| 1923 | 27.9 mm (1.1 in) |
| 1924 | 40.6 mm (1.6 in) |
| 1925 | 43.2 mm (1.7 in) |
| 1926 | 41.7 mm (1.6 in) |
| 1927 | 22.4 mm (0.9 in) |
| 1928 | 48.5 mm (1.9 in) |
| 1929 | 22.6 mm (0.9 in) |
| 1930 | 15.2 mm (0.6 in) |
| 1931 | 18.5 mm (0.7 in) |
| 1932 | 20.3 mm (0.8 in) |
| 1933 | 21.6 mm (0.9 in) |
| 1934 | 15.7 mm (0.6 in) |
| 1935 | 26.2 mm (1.0 in) |
| 1936 | 22.4 mm (0.9 in) |
| 1937 | 35.6 mm (1.4 in) |
| 1938 | 16.5 mm (0.6 in) |
| 1939 | 69.6 mm (2.7 in) |
| 1940 | 28.7 mm (1.1 in) |
| 1941 | 25.4 mm (1.0 in) |
| 1942 | 20.3 mm (0.8 in) |
| 1943 | 19.6 mm (0.8 in) |
| 1944 | 21.3 mm (0.8 in) |
| 1945 | 19.1 mm (0.8 in) |
| 1946 | 21.6 mm (0.9 in) |
| 1947 | 16.8 mm (0.7 in) |
| 1948 | 40.9 mm (1.6 in) |
| 1949 | 5.8 mm (0.23 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1905 | n/a |
| 1906 | n/a |
| 1907 | 45.5 mm (1.8 in) |
| 1908 | 44.9 mm (1.8 in) |
| 1909 | 75.4 mm (3.0 in) |
| 1910 | 96.3 mm (3.8 in) |
| 1911 | 22.9 mm (0.9 in) |
| 1912 | 47.2 mm (1.9 in) |
| 1913 | 53.4 mm (2.1 in) |
| 1914 | 60.7 mm (2.4 in) |
| 1915 | 44.4 mm (1.7 in) |
| 1916 | 24.1 mm (0.9 in) |
| 1917 | 44.4 mm (1.7 in) |
| 1918 | 23.4 mm (0.9 in) |
| 1919 | 29.9 mm (1.2 in) |
| 1920 | 59.8 mm (2.4 in) |
| 1921 | 33.6 mm (1.3 in) |
| 1922 | 35.8 mm (1.4 in) |
| 1923 | 27.9 mm (1.1 in) |
| 1924 | 52.0 mm (2.0 in) |
| 1925 | 52.0 mm (2.0 in) |
| 1926 | 82.8 mm (3.3 in) |
| 1927 | 47.9 mm (1.9 in) |
| 1928 | 67.4 mm (2.7 in) |
| 1929 | 48.1 mm (1.9 in) |
| 1930 | 31.2 mm (1.2 in) |
| 1931 | 28.5 mm (1.1 in) |
| 1932 | 37.1 mm (1.5 in) |
| 1933 | 47.5 mm (1.9 in) |
| 1934 | 33.9 mm (1.3 in) |
| 1935 | 27.9 mm (1.1 in) |
| 1936 | 58.3 mm (2.3 in) |
| 1937 | 74.5 mm (2.9 in) |
| 1938 | 34.6 mm (1.4 in) |
| 1939 | 99.6 mm (3.9 in) |
| 1940 | 53.4 mm (2.1 in) |
| 1941 | 60.9 mm (2.4 in) |
| 1942 | 42.1 mm (1.7 in) |
| 1943 | 54.6 mm (2.1 in) |
| 1944 | 47.5 mm (1.9 in) |
| 1945 | 42.8 mm (1.7 in) |
| 1946 | 36.1 mm (1.4 in) |
| 1947 | 22.1 mm (0.9 in) |
| 1948 | 45.6 mm (1.8 in) |
| 1949 | 5.8 mm (0.23 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1905 | n/a |
| 1906 | n/a |
| 1907 | 15 days |
| 1908 | 113 days |
| 1909 | 28 days |
| 1910 | 58 days |
| 1911 | 51 days |
| 1912 | 45 days |
| 1913 | 28 days |
| 1914 | 38 days |
| 1915 | 51 days |
| 1916 | 60 days |
| 1917 | 40 days |
| 1918 | 48 days |
| 1919 | 67 days |
| 1920 | 37 days |
| 1921 | 74 days |
| 1922 | 41 days |
| 1923 | 56 days |
| 1924 | 35 days |
| 1925 | 57 days |
| 1926 | 146 days |
| 1927 | 62 days |
| 1928 | 43 days |
| 1929 | 112 days |
| 1930 | 35 days |
| 1931 | 70 days |
| 1932 | 95 days |
| 1933 | 32 days |
| 1934 | 77 days |
| 1935 | 50 days |
| 1936 | 57 days |
| 1937 | 54 days |
| 1938 | 76 days |
| 1939 | 51 days |
| 1940 | 69 days |
| 1941 | 23 days |
| 1942 | 41 days |
| 1943 | 24 days |
| 1944 | 30 days |
| 1945 | 39 days |
| 1946 | 38 days |
| 1947 | 48 days |
| 1948 | 44 days |
| 1949 | 30 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
29 years with a frostAcross 29 years with a frost, the median last spring frost at Yonna falls on 18 June and the median first autumn frost on 30 August, which leaves a median of 81 days between them.
Fitted over all years, the growing season changes by +31.1 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1909 to 1943) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 18 June | n/a | 18 June | n/a | -4.5 days per decade |
| First autumn frost | 30 August | n/a | 30 August | n/a | +26.6 days per decade |
| Growing days | 81 days | n/a | 81 days | n/a | +31.1 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
30 years, 1908 to 1943A day with at least 22.4 mm (0.9 in) of rain is expected about once in 2 years. A day with at least 83.5 mm (3.3 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 22.4 mm (0.9 in) | |
| 5 years | 32.2 mm (1.3 in) | |
| 10 years | 40.7 mm (1.6 in) | |
| 25 years | 54.5 mm (2.1 in) | |
| 50 years | 67.6 mm (2.7 in) | Longer than the 30 years of record |
| 100 years | 83.5 mm (3.3 in) | Longer than the 30 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, 30 years of values from 1908 to 1943.
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: 69.6 mm (2.7 in) in 1939; 48.5 mm (1.9 in) in 1928; 44.2 mm (1.7 in) in 1910.
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).