Williamstown Threshold Days by Year (USC00199731)
16 fixed thresholds counted per year at Williamstown (USC00199731): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Williamstown Thresholds
- Williamstown: days with a maximum temperature at or below 0 C (32 F) in 49 years, most in 1904 with 80.
- Williamstown: days with a maximum temperature at or above 30 C (86 F) in 48 years, most in 1944 with 25.
- Williamstown: nights with a minimum temperature at or below 0 C (32 F) in 48 years, most in 1926 with 171.
- Williamstown: nights with a minimum temperature at or below -10 C (14 F) in 48 years, most in 1904 with 76.
- 16 fixed thresholds have at least one qualifying day at Williamstown.
Days at or above 30 C (86 F)
48 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1886 | 2 | 2 |
| 1887 | 2 | 2 |
| 1893 | 2 | 5.8 |
| 1894 | 9 | 5.8 |
| 1898 | 6 | 5.8 |
| 1899 | 6 | 5.8 |
| 1901 | 11 | 5.4 |
| 1903 | 1 | 5.4 |
| 1904 | 2 | 5.4 |
| 1905 | 7 | 5.4 |
| 1906 | 3 | 5.4 |
| 1907 | 4 | 5.4 |
| 1908 | 6 | 5.4 |
| 1909 | 9 | 5.4 |
| 1910 | 5 | 10.3 |
| 1911 | 18 | 10.3 |
| 1912 | 10 | 10.3 |
| 1913 | 11 | 10.3 |
| 1914 | 10 | 10.3 |
| 1915 | 3 | 10.3 |
| 1916 | 11 | 10.3 |
| 1917 | 10 | 10.3 |
| 1918 | 15 | 10.3 |
| 1919 | 10 | 10.3 |
| 1920 | 2 | 7.8 |
| 1921 | 10 | 7.8 |
| 1923 | 8 | 7.8 |
| 1924 | 9 | 7.8 |
| 1925 | 9 | 7.8 |
| 1926 | 4 | 7.8 |
| 1927 | 5 | 7.8 |
| 1928 | 10 | 7.8 |
| 1929 | 13 | 7.8 |
| 1930 | 15 | 13.3 |
| 1931 | 14 | 13.3 |
| 1932 | 2 | 13.3 |
| 1933 | 19 | 13.3 |
| 1934 | 15 | 13.3 |
| 1935 | 10 | 13.3 |
| 1936 | 9 | 13.3 |
| 1937 | 21 | 13.3 |
| 1938 | 15 | 13.3 |
| 1939 | 13 | 13.3 |
| 1940 | 5 | 12.8 |
| 1941 | 14 | 12.8 |
| 1942 | 5 | 12.8 |
| 1944 | 25 | 12.8 |
| 1947 | 15 | 12.8 |
| Year | First date | Last date |
|---|---|---|
| 1886 | 1886-07-06 | 1886-07-07 |
| 1887 | 1887-07-02 | 1887-07-03 |
| 1893 | 1893-06-21 | 1893-08-10 |
| 1894 | 1894-06-18 | 1894-07-29 |
| 1898 | 1898-06-29 | 1898-09-04 |
| 1899 | 1899-06-05 | 1899-08-21 |
| 1901 | 1901-06-26 | 1901-07-21 |
| 1903 | 1903-07-09 | 1903-07-09 |
| 1904 | 1904-06-25 | 1904-07-19 |
| 1905 | 1905-06-16 | 1905-07-19 |
| 1906 | 1906-05-18 | 1906-08-06 |
| 1907 | 1907-06-18 | 1907-08-12 |
| 1908 | 1908-06-24 | 1908-08-13 |
| 1909 | 1909-06-22 | 1909-08-25 |
| 1910 | 1910-07-03 | 1910-07-24 |
| 1911 | 1911-05-11 | 1911-08-10 |
| 1912 | 1912-07-03 | 1912-07-15 |
| 1913 | 1913-06-16 | 1913-08-18 |
| 1914 | 1914-05-26 | 1914-09-23 |
| 1915 | 1915-08-01 | 1915-09-16 |
| 1916 | 1916-07-12 | 1916-08-23 |
| 1917 | 1917-07-22 | 1917-08-07 |
| 1918 | 1918-06-01 | 1918-08-24 |
| 1919 | 1919-06-03 | 1919-07-19 |
| 1920 | 1920-06-01 | 1920-06-02 |
| 1921 | 1921-05-22 | 1921-07-28 |
| 1923 | 1923-06-05 | 1923-08-05 |
| 1924 | 1924-07-05 | 1924-08-31 |
| 1925 | 1925-06-03 | 1925-07-10 |
| 1926 | 1926-07-09 | 1926-07-22 |
| 1927 | 1927-06-10 | 1927-07-17 |
| 1928 | 1928-07-03 | 1928-08-30 |
| 1929 | 1929-05-28 | 1929-09-04 |
| 1930 | 1930-05-07 | 1930-09-16 |
| 1931 | 1931-05-29 | 1931-09-11 |
| 1932 | 1932-05-16 | 1932-08-26 |
| 1933 | 1933-06-08 | 1933-08-02 |
| 1934 | 1934-05-22 | 1934-08-10 |
| 1935 | 1935-07-05 | 1935-08-18 |
| 1936 | 1936-07-08 | 1936-08-14 |
| 1937 | 1937-06-01 | 1937-09-03 |
| 1938 | 1938-06-07 | 1938-08-16 |
| 1939 | 1939-06-11 | 1939-09-16 |
| 1940 | 1940-06-05 | 1940-07-30 |
| 1941 | 1941-04-20 | 1941-09-10 |
| 1942 | 1942-06-11 | 1942-07-20 |
| 1944 | 1944-05-04 | 1944-10-07 |
| 1947 | 1947-05-29 | 1947-08-25 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 48 | 25 | 1944 | 15 |
| 35 C (95 F): Days | 8 | 3 | 1911 | 1 |
| 90 F (32.2 C): Days | 34 | 11 | 1944 | 3 |
| 0 C (32 F): Ice days (max | 49 | 80 | 1904 | 45 |
| 0 C (32 F): Frost days (min | 48 | 171 | 1926 | 125 |
| -10 C (14 F): Days with min | 48 | 76 | 1904 | 31 |
| -20 C (-4 F): Days with min | 46 | 15 | 1886 | 1 |
| -30 C (-22 F): Days with min | 5 | 1 | 1899 | 1 |
| 20 C (68 F): Tropical nights (min | 48 | 15 | 1938 | 9 |
| 25 C (77 F): Days with min | 1 | 1 | 1917 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 45 | 48 | 1898 | 29 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 44 | 12 | 1920 | 6 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 27 | 2 | 1901 | 1 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 1 | 1 | 1927 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 5 | 7 | 1947 | 7 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 2 | 2 | 1947 | 2 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1886.
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). Threshold counts are computed by this site.
Data as of . Last revised (2025-12-31).