Runnymede Spottsville Weather Records (USC00447435)
Record envelope, standing records and threshold days for Runnymede Spottsville (USC00447435), Virginia, United States, with 39 years of record.
Key Facts for Runnymede Spottsville
- Runnymede Spottsville (USC00447435) is a weather station in Virginia, United States at 37.12 latitude and -76.70 longitude, 15 m (50 ft) above sea level.
- The station reports from 1893 to 1931, 39 years of record.
- 1,464 records set at Runnymede Spottsville still stand.
- Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
- Runnymede Spottsville tied a daily record high minimum temperature of 20.0 C (68.0 F) on 30 May 1931.
About the Station
- Location: Virginia, United States, 37.12 latitude, -76.70 longitude.
- Elevation: 15 m (50 ft).
- Period of record: 1893 to 1931, 39 years.
- Eligible elements: tmax, tmin, prcp.
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 | 25.0 C (77.0 F) | -26.1 C (-15.0 F) | n/a | n/a |
| Feb | 30.6 C (87.1 F) | -21.1 C (-6.0 F) | n/a | n/a |
| Mar | 33.9 C (93.0 F) | -12.2 C (10.0 F) | n/a | n/a |
| Apr | 35.6 C (96.1 F) | -6.7 C (19.9 F) | n/a | n/a |
| May | 36.1 C (97.0 F) | -0.6 C (30.9 F) | n/a | n/a |
| Jun | 38.3 C (100.9 F) | 4.4 C (39.9 F) | n/a | n/a |
| Jul | 41.7 C (107.1 F) | 8.9 C (48.0 F) | n/a | n/a |
| Aug | 40.0 C (104.0 F) | 7.8 C (46.0 F) | n/a | n/a |
| Sep | 38.3 C (100.9 F) | 2.8 C (37.0 F) | n/a | n/a |
| Oct | 33.3 C (91.9 F) | -4.4 C (24.1 F) | n/a | n/a |
| Nov | 28.3 C (82.9 F) | -10.6 C (12.9 F) | n/a | n/a |
| Dec | 25.0 C (77.0 F) | -17.8 C (0.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1893 | 55 |
| 1894 | 30 |
| 1895 | 55 |
| 1896 | 53 |
| 1897 | 19 |
| 1898 | 42 |
| 1899 | 43 |
| 1900 | 63 |
| 1901 | 41 |
| 1902 | 29 |
| 1903 | 39 |
| 1904 | 35 |
| 1905 | 35 |
| 1906 | 33 |
| 1907 | 40 |
| 1908 | 37 |
| 1909 | 34 |
| 1910 | 29 |
| 1911 | 22 |
| 1912 | 42 |
| 1913 | 52 |
| 1914 | 58 |
| 1915 | 36 |
| 1916 | 30 |
| 1917 | 40 |
| 1918 | 48 |
| 1919 | 40 |
| 1920 | 28 |
| 1921 | 42 |
| 1922 | 31 |
| 1923 | 28 |
| 1924 | 40 |
| 1925 | 35 |
| 1926 | 29 |
| 1927 | 40 |
| 1928 | 21 |
| 1929 | 36 |
| 1930 | 51 |
| 1931 | 3 |
All-Time Record Progression
1 new records| Date | Kind | Detail |
|---|---|---|
| 1925-07-09 | Record high minimum temperature | Record high minimum temperature 28.9 C (84.0 F) |
Wettest Day of Each Month
Aug: 122.4 mm (4.8 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 53.3 mm (2.1 in) | 6 January 1929 |
| Feb | 88.4 mm (3.5 in) | 4 February 1920 |
| Mar | 71.6 mm (2.8 in) | 17 March 1923 |
| Apr | 74.2 mm (2.9 in) | 9 April 1918 |
| May | 57.9 mm (2.3 in) | 14 May 1918 |
| Jun | 100.3 mm (3.9 in) | 26 June 1918 |
| Jul | 96.5 mm (3.8 in) | 11 July 1914 |
| Aug | 122.4 mm (4.8 in) | 14 August 1898 |
| Sep | 84.3 mm (3.3 in) | 18 September 1912 |
| Oct | 104.6 mm (4.1 in) | 1 October 1929 |
| Nov | 111.3 mm (4.4 in) | 8 November 1893 |
| Dec | 63.8 mm (2.5 in) | 2 December 1925 |
Period of Record Coverage
1893 to 1931| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1893 | 363 | 99% | Yes |
| 1894 | 361 | 99% | Yes |
| 1895 | 361 | 99% | Yes |
| 1896 | 361 | 99% | Yes |
| 1897 | 362 | 99% | Yes |
| 1898 | 362 | 99% | Yes |
| 1899 | 364 | 100% | Yes |
| 1900 | 363 | 99% | Yes |
| 1901 | 357 | 98% | Yes |
| 1902 | 349 | 96% | Yes |
| 1903 | 363 | 99% | Yes |
| 1904 | 365 | 100% | Yes |
| 1905 | 362 | 99% | Yes |
| 1906 | 360 | 99% | Yes |
| 1907 | 353 | 97% | Yes |
| 1908 | 350 | 96% | Yes |
| 1909 | 363 | 99% | Yes |
| 1910 | 362 | 99% | Yes |
| 1911 | 361 | 99% | Yes |
| 1912 | 363 | 99% | Yes |
| 1913 | 361 | 99% | Yes |
| 1914 | 358 | 98% | Yes |
| 1915 | 365 | 100% | Yes |
| 1916 | 363 | 99% | Yes |
| 1917 | 364 | 100% | Yes |
| 1918 | 362 | 99% | Yes |
| 1919 | 365 | 100% | Yes |
| 1920 | 366 | 100% | Yes |
| 1921 | 365 | 100% | Yes |
| 1922 | 364 | 100% | Yes |
| 1923 | 363 | 99% | Yes |
| 1924 | 366 | 100% | Yes |
| 1925 | 333 | 91% | Yes |
| 1926 | 360 | 99% | Yes |
| 1927 | 361 | 99% | Yes |
| 1928 | 353 | 96% | Yes |
| 1929 | 357 | 98% | Yes |
| 1930 | 301 | 82% | No |
| 1931 | 141 | 39% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 30 May 1931 | Runnymede Spottsville, US | daily high min (Tie) | 20.0 C (68.0 F) | tie | 22 years | 2 of 100 (Routine) |
| 17 May 1931 | Runnymede Spottsville, US | daily rain | 12.2 mm (0.5 in) | 0.8 mm (0.03 in) | 17 years | 8 of 100 (Routine) |
| 1 May 1931 | Runnymede Spottsville, US | daily rain | 32.5 mm (1.3 in) | 5.6 mm (0.22 in) | 2 years | 8 of 100 (Routine) |
| 1 May 1931 | Runnymede Spottsville, US | daily low max (Tie) | 15.6 C (60.1 F) | tie | 35 years | 3 of 100 (Routine) |
| 28 April 1931 | Runnymede Spottsville, US | daily low min | 0.0 C (32.0 F) | 0.6 C (1.1 F) | 33 years | 14 of 100 (Routine) |
| 13 April 1931 | Runnymede Spottsville, US | daily low min | -1.1 C (30.0 F) | 1.1 C (2.0 F) | 36 years | 16 of 100 (Routine) |
| 7 April 1931 | Runnymede Spottsville, US | daily low max (Tie) | 7.2 C (45.0 F) | tie | 24 years | 2 of 100 (Routine) |
| 6 April 1931 | Runnymede Spottsville, US | daily low max | 7.8 C (46.0 F) | 2.8 C (5.0 F) | 8 years | 9 of 100 (Routine) |
| 5 April 1931 | Runnymede Spottsville, US | daily rain | 29.7 mm (1.2 in) | 0.7 mm (0.03 in) | 25 years | 10 of 100 (Routine) |
| 1 March 1931 | Runnymede Spottsville, US | daily rain | 29.0 mm (1.1 in) | 2.6 mm (0.10 in) | 30 years | 14 of 100 (Routine) |
| 27 January 1931 | Runnymede Spottsville, US | daily high max (Tie) | 21.1 C (70.0 F) | tie | 15 years | 1 of 100 (Routine) |
| 25 December 1930 | Runnymede Spottsville, US | daily low min | -13.3 C (8.1 F) | 2.7 C (4.9 F) | 33 years | 17 of 100 (Routine) |
| 17 December 1930 | Runnymede Spottsville, US | daily low max | -1.1 C (30.0 F) | 2.2 C (4.0 F) | 25 years | 13 of 100 (Routine) |
| 7 December 1930 | Runnymede Spottsville, US | daily rain | 24.1 mm (0.9 in) | 1.2 mm (0.05 in) | 21 years | 10 of 100 (Routine) |
| 3 December 1930 | Runnymede Spottsville, US | daily low min (Tie) | -9.4 C (15.1 F) | tie | 33 years | 3 of 100 (Routine) |
| 29 November 1930 | Runnymede Spottsville, US | monthly low min | -10.6 C (12.9 F) | 0.6 C (1.1 F) | 0 years | 14 of 100 (Routine) |
| 28 November 1930 | Runnymede Spottsville, US | monthly low min | -10.0 C (14.0 F) | 0.6 C (1.1 F) | 5 years | 15 of 100 (Routine) |
| 16 November 1930 | Runnymede Spottsville, US | daily high min (Tie) | 13.9 C (57.0 F) | tie | 3 years | 0 of 100 (Routine) |
| 9 November 1930 | Runnymede Spottsville, US | daily low min | -5.0 C (23.0 F) | 1.7 C (3.1 F) | 27 years | 14 of 100 (Routine) |
| 2 November 1930 | Runnymede Spottsville, US | daily low min | -3.9 C (25.0 F) | 0.6 C (1.1 F) | 24 years | 11 of 100 (Routine) |
Climate Trend
36 complete years, 1893 to 1929| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1893 | 13.4 C | -1.10 C |
| 1894 | 14.6 C | +0.11 C |
| 1895 | 13.3 C | -1.14 C |
| 1896 | 14.3 C | -0.13 C |
| 1897 | 14.7 C | +0.20 C |
| 1898 | 14.9 C | +0.43 C |
| 1899 | 14.3 C | -0.18 C |
| 1900 | 15.2 C | +0.71 C |
| 1901 | 13.9 C | -0.60 C |
| 1902 | 14.5 C | +0.04 C |
| 1903 | 14.1 C | -0.32 C |
| 1904 | 13.0 C | -1.50 C |
| 1905 | 14.0 C | -0.45 C |
| 1906 | 14.8 C | +0.33 C |
| 1907 | 13.9 C | -0.57 C |
| 1908 | 14.6 C | +0.17 C |
| 1909 | 14.6 C | +0.17 C |
| 1910 | 14.2 C | -0.26 C |
| 1911 | 15.2 C | +0.76 C |
| 1912 | 14.6 C | +0.09 C |
| 1913 | 15.7 C | +1.25 C |
| 1914 | 14.0 C | -0.42 C |
| 1915 | 14.2 C | -0.27 C |
| 1916 | 14.0 C | -0.43 C |
| 1917 | 12.9 C | -1.53 C |
| 1918 | 14.7 C | +0.26 C |
| 1919 | 15.4 C | +0.94 C |
| 1920 | 14.3 C | -0.15 C |
| 1921 | 16.1 C | +1.68 C |
| 1922 | 15.2 C | +0.76 C |
| 1923 | 15.1 C | +0.60 C |
| 1924 | 14.1 C | -0.35 C |
| 1926 | 14.5 C | +0.07 C |
| 1927 | 14.9 C | +0.43 C |
| 1928 | 14.5 C | +0.02 C |
| 1929 | 14.7 C | +0.24 C |
The fitted trend in annual mean temperature here over 1893 to 1929 is 0.21 C (-0.01 to 0.42) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.37 F (-0.01 to 0.76) per decade. The slope is a straight line fitted to 36 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.21 C (-0.01 to 0.42) per decade | 0.37 F (-0.01 to 0.76) per decade | 1893 to 1929 | 36 | Not clearly different from zero |
| Mean daily maximum | 0.2 C (-0.1 to 0.4) per decade | 0.3 F (-0.1 to 0.7) per decade | 1893 to 1929 | 36 | Not clearly different from zero |
| Mean daily minimum | 0.25 C (0.02 to 0.47) per decade | 0.44 F (0.04 to 0.85) per decade | 1893 to 1929 | 36 | 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
1893 to 1931| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 41.7 C (107.1 F) | 1901 | 36.7 C (98.1 F) | 39 |
| Coldest night (TNn) | -26.1 C (-15.0 F) | 1893 | -13.3 C (8.1 F) | 39 |
| Wettest day (Rx1day) | 122.4 mm (4.8 in) | 1898 | 64.5 mm (2.5 in) | 39 |
| Wettest five days (Rx5day) | 185.9 mm (7.3 in) | 1906 | 108.9 mm (4.3 in) | 39 |
| Longest dry spell (CDD) | 39 days | 1901 | 19 days | 39 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1893 | 36.7 C (98.1 F) |
| 1894 | 37.2 C (99.0 F) |
| 1895 | 37.8 C (100.0 F) |
| 1896 | 37.8 C (100.0 F) |
| 1897 | 36.7 C (98.1 F) |
| 1898 | 37.2 C (99.0 F) |
| 1899 | 37.8 C (100.0 F) |
| 1900 | 38.3 C (100.9 F) |
| 1901 | 41.7 C (107.1 F) |
| 1902 | 38.3 C (100.9 F) |
| 1903 | 36.7 C (98.1 F) |
| 1904 | 36.7 C (98.1 F) |
| 1905 | 36.7 C (98.1 F) |
| 1906 | 35.6 C (96.1 F) |
| 1907 | 35.0 C (95.0 F) |
| 1908 | 35.6 C (96.1 F) |
| 1909 | 35.0 C (95.0 F) |
| 1910 | 34.4 C (93.9 F) |
| 1911 | 37.8 C (100.0 F) |
| 1912 | 36.7 C (98.1 F) |
| 1913 | 37.2 C (99.0 F) |
| 1914 | 38.3 C (100.9 F) |
| 1915 | 36.7 C (98.1 F) |
| 1916 | 35.6 C (96.1 F) |
| 1917 | 36.1 C (97.0 F) |
| 1918 | 40.0 C (104.0 F) |
| 1919 | 35.6 C (96.1 F) |
| 1920 | 35.6 C (96.1 F) |
| 1921 | 37.8 C (100.0 F) |
| 1922 | 34.4 C (93.9 F) |
| 1923 | 37.2 C (99.0 F) |
| 1924 | 35.6 C (96.1 F) |
| 1925 | 36.1 C (97.0 F) |
| 1926 | 37.2 C (99.0 F) |
| 1927 | 34.4 C (93.9 F) |
| 1928 | 36.7 C (98.1 F) |
| 1929 | 33.9 C (93.0 F) |
| 1930 | 39.4 C (102.9 F) |
| 1931 | 31.1 C (88.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1893 | -26.1 C (-15.0 F) |
| 1894 | -12.2 C (10.0 F) |
| 1895 | -19.4 C (-2.9 F) |
| 1896 | -16.1 C (3.0 F) |
| 1897 | -12.8 C (9.0 F) |
| 1898 | -12.8 C (9.0 F) |
| 1899 | -21.1 C (-6.0 F) |
| 1900 | -14.4 C (6.1 F) |
| 1901 | -13.9 C (7.0 F) |
| 1902 | -13.3 C (8.1 F) |
| 1903 | -11.1 C (12.0 F) |
| 1904 | -18.3 C (-0.9 F) |
| 1905 | -15.6 C (3.9 F) |
| 1906 | -10.6 C (12.9 F) |
| 1907 | -13.9 C (7.0 F) |
| 1908 | -10.0 C (14.0 F) |
| 1909 | -13.9 C (7.0 F) |
| 1910 | -12.8 C (9.0 F) |
| 1911 | -8.3 C (17.1 F) |
| 1912 | -17.8 C (0.0 F) |
| 1913 | -11.1 C (12.0 F) |
| 1914 | -14.4 C (6.1 F) |
| 1915 | -10.0 C (14.0 F) |
| 1916 | -12.8 C (9.0 F) |
| 1917 | -16.7 C (1.9 F) |
| 1918 | -19.4 C (-2.9 F) |
| 1919 | -9.4 C (15.1 F) |
| 1920 | -14.4 C (6.1 F) |
| 1921 | -11.1 C (12.0 F) |
| 1922 | -12.2 C (10.0 F) |
| 1923 | -11.1 C (12.0 F) |
| 1924 | -13.9 C (7.0 F) |
| 1925 | -12.8 C (9.0 F) |
| 1926 | -13.3 C (8.1 F) |
| 1927 | -12.2 C (10.0 F) |
| 1928 | -12.8 C (9.0 F) |
| 1929 | -13.3 C (8.1 F) |
| 1930 | -13.3 C (8.1 F) |
| 1931 | -17.8 C (0.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1893 | 111.3 mm (4.4 in) |
| 1894 | 58.4 mm (2.3 in) |
| 1895 | 43.9 mm (1.7 in) |
| 1896 | 76.2 mm (3.0 in) |
| 1897 | 80.3 mm (3.2 in) |
| 1898 | 122.4 mm (4.8 in) |
| 1899 | 48.3 mm (1.9 in) |
| 1900 | 50.8 mm (2.0 in) |
| 1901 | 67.6 mm (2.7 in) |
| 1902 | 53.3 mm (2.1 in) |
| 1903 | 56.6 mm (2.2 in) |
| 1904 | 57.4 mm (2.3 in) |
| 1905 | 61.7 mm (2.4 in) |
| 1906 | 113.0 mm (4.4 in) |
| 1907 | 54.9 mm (2.2 in) |
| 1908 | 64.5 mm (2.5 in) |
| 1909 | 62.0 mm (2.4 in) |
| 1910 | 101.6 mm (4.0 in) |
| 1911 | 40.6 mm (1.6 in) |
| 1912 | 84.3 mm (3.3 in) |
| 1913 | 69.9 mm (2.8 in) |
| 1914 | 96.5 mm (3.8 in) |
| 1915 | 63.2 mm (2.5 in) |
| 1916 | 54.9 mm (2.2 in) |
| 1917 | 66.3 mm (2.6 in) |
| 1918 | 100.3 mm (3.9 in) |
| 1919 | 77.7 mm (3.1 in) |
| 1920 | 88.4 mm (3.5 in) |
| 1921 | 54.6 mm (2.1 in) |
| 1922 | 73.9 mm (2.9 in) |
| 1923 | 76.2 mm (3.0 in) |
| 1924 | 57.2 mm (2.3 in) |
| 1925 | 63.8 mm (2.5 in) |
| 1926 | 86.4 mm (3.4 in) |
| 1927 | 59.9 mm (2.4 in) |
| 1928 | 75.2 mm (3.0 in) |
| 1929 | 104.6 mm (4.1 in) |
| 1930 | 47.5 mm (1.9 in) |
| 1931 | 32.5 mm (1.3 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1893 | 134.4 mm (5.3 in) |
| 1894 | 134.4 mm (5.3 in) |
| 1895 | 87.4 mm (3.4 in) |
| 1896 | 183.4 mm (7.2 in) |
| 1897 | 142.8 mm (5.6 in) |
| 1898 | 180.1 mm (7.1 in) |
| 1899 | 81.0 mm (3.2 in) |
| 1900 | 66.8 mm (2.6 in) |
| 1901 | 76.4 mm (3.0 in) |
| 1902 | 83.8 mm (3.3 in) |
| 1903 | 108.9 mm (4.3 in) |
| 1904 | 69.6 mm (2.7 in) |
| 1905 | 94.5 mm (3.7 in) |
| 1906 | 185.9 mm (7.3 in) |
| 1907 | 107.3 mm (4.2 in) |
| 1908 | 144.0 mm (5.7 in) |
| 1909 | 121.2 mm (4.8 in) |
| 1910 | 128.0 mm (5.0 in) |
| 1911 | 79.8 mm (3.1 in) |
| 1912 | 88.9 mm (3.5 in) |
| 1913 | 109.7 mm (4.3 in) |
| 1914 | 125.0 mm (4.9 in) |
| 1915 | 144.4 mm (5.7 in) |
| 1916 | 64.5 mm (2.5 in) |
| 1917 | 107.8 mm (4.2 in) |
| 1918 | 124.0 mm (4.9 in) |
| 1919 | 161.6 mm (6.4 in) |
| 1920 | 172.8 mm (6.8 in) |
| 1921 | 76.2 mm (3.0 in) |
| 1922 | 101.6 mm (4.0 in) |
| 1923 | 118.6 mm (4.7 in) |
| 1924 | 106.5 mm (4.2 in) |
| 1925 | 88.7 mm (3.5 in) |
| 1926 | 142.1 mm (5.6 in) |
| 1927 | 124.9 mm (4.9 in) |
| 1928 | 92.2 mm (3.6 in) |
| 1929 | 139.4 mm (5.5 in) |
| 1930 | 88.7 mm (3.5 in) |
| 1931 | 76.2 mm (3.0 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1893 | 13 days |
| 1894 | 16 days |
| 1895 | 18 days |
| 1896 | 19 days |
| 1897 | 18 days |
| 1898 | 12 days |
| 1899 | 18 days |
| 1900 | 17 days |
| 1901 | 39 days |
| 1902 | 18 days |
| 1903 | 25 days |
| 1904 | 21 days |
| 1905 | 11 days |
| 1906 | 17 days |
| 1907 | 18 days |
| 1908 | 20 days |
| 1909 | 20 days |
| 1910 | 21 days |
| 1911 | 17 days |
| 1912 | 16 days |
| 1913 | 15 days |
| 1914 | 19 days |
| 1915 | 21 days |
| 1916 | 21 days |
| 1917 | 20 days |
| 1918 | 16 days |
| 1919 | 21 days |
| 1920 | 27 days |
| 1921 | 21 days |
| 1922 | 26 days |
| 1923 | 25 days |
| 1924 | 27 days |
| 1925 | 16 days |
| 1926 | 19 days |
| 1927 | 21 days |
| 1928 | 22 days |
| 1929 | 15 days |
| 1930 | 33 days |
| 1931 | 14 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
36 years with a frostAcross 36 years with a frost, the median last spring frost at Runnymede Spottsville falls on 16 April and the median first autumn frost on 23 October, which leaves a median of 187 days between them.
Fitted over all years, the growing season changes by +1.7 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1899 to 1929) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 16 April | n/a | 17 April | n/a | +2.3 days per decade |
| First autumn frost | 23 October | n/a | 25 October | n/a | +4.0 days per decade |
| Growing days | 187 days | n/a | 187 days | n/a | +1.7 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
35 years, 1893 to 1927A day with at least 67.0 mm (2.6 in) of rain is expected about once in 2 years. A day with at least 145.7 mm (5.7 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 67.0 mm (2.6 in) | |
| 5 years | 85.6 mm (3.4 in) | |
| 10 years | 98.8 mm (3.9 in) | |
| 25 years | 116.7 mm (4.6 in) | |
| 50 years | 130.9 mm (5.2 in) | Longer than the 35 years of record |
| 100 years | 145.7 mm (5.7 in) | Longer than the 35 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, 35 years of values from 1893 to 1927.
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: 122.4 mm (4.8 in) in 1898; 113.0 mm (4.4 in) in 1906; 111.3 mm (4.4 in) in 1893.
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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2025-12-31).