Boston City WSO Threshold Days by Year (USW00094701)
17 fixed thresholds counted per year at Boston City WSO (USW00094701): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Boston City WSO Thresholds
- Boston City WSO: days with a maximum temperature at or above 30 C (86 F) in 43 years, most in 1929 with 34.
- Boston City WSO: days with a maximum temperature at or above 90 F (32.2 C) in 43 years, most in 1930 with 19.
- Boston City WSO: days with a maximum temperature at or below 0 C (32 F) in 43 years, most in 1904 with 57.
- Boston City WSO: nights with a minimum temperature at or below 0 C (32 F) in 43 years, most in 1904 with 140.
- 17 fixed thresholds have at least one qualifying day at Boston City WSO.
Days at or above 30 C (86 F)
43 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1893 | 13 | 21.1 |
| 1894 | 30 | 21.1 |
| 1895 | 18 | 21.1 |
| 1896 | 20 | 21.1 |
| 1897 | 17 | 21.1 |
| 1898 | 25 | 21.1 |
| 1899 | 25 | 21.1 |
| 1900 | 33 | 19.4 |
| 1901 | 23 | 19.4 |
| 1902 | 10 | 19.4 |
| 1903 | 15 | 19.4 |
| 1904 | 11 | 19.4 |
| 1905 | 20 | 19.4 |
| 1906 | 14 | 19.4 |
| 1907 | 20 | 19.4 |
| 1908 | 27 | 19.4 |
| 1909 | 21 | 19.4 |
| 1910 | 22 | 21.6 |
| 1911 | 25 | 21.6 |
| 1912 | 27 | 21.6 |
| 1913 | 25 | 21.6 |
| 1914 | 24 | 21.6 |
| 1915 | 19 | 21.6 |
| 1916 | 17 | 21.6 |
| 1917 | 16 | 21.6 |
| 1918 | 21 | 21.6 |
| 1919 | 20 | 21.6 |
| 1920 | 18 | 22.4 |
| 1921 | 24 | 22.4 |
| 1922 | 18 | 22.4 |
| 1923 | 24 | 22.4 |
| 1924 | 28 | 22.4 |
| 1925 | 28 | 22.4 |
| 1926 | 13 | 22.4 |
| 1927 | 14 | 22.4 |
| 1928 | 23 | 22.4 |
| 1929 | 34 | 22.4 |
| 1930 | 30 | 23.8 |
| 1931 | 28 | 23.8 |
| 1932 | 26 | 23.8 |
| 1933 | 27 | 23.8 |
| 1934 | 18 | 23.8 |
| 1935 | 14 | 23.8 |
| Year | First date | Last date |
|---|---|---|
| 1893 | 1893-05-23 | 1893-08-26 |
| 1894 | 1894-05-02 | 1894-09-10 |
| 1895 | 1895-05-07 | 1895-09-23 |
| 1896 | 1896-05-10 | 1896-09-11 |
| 1897 | 1897-06-24 | 1897-10-16 |
| 1898 | 1898-06-09 | 1898-09-07 |
| 1899 | 1899-05-01 | 1899-08-31 |
| 1900 | 1900-05-15 | 1900-09-12 |
| 1901 | 1901-06-06 | 1901-09-05 |
| 1902 | 1902-05-23 | 1902-09-02 |
| 1903 | 1903-05-18 | 1903-09-15 |
| 1904 | 1904-05-26 | 1904-09-12 |
| 1905 | 1905-06-16 | 1905-08-24 |
| 1906 | 1906-05-19 | 1906-09-19 |
| 1907 | 1907-06-18 | 1907-09-21 |
| 1908 | 1908-05-26 | 1908-09-11 |
| 1909 | 1909-06-03 | 1909-08-26 |
| 1910 | 1910-05-24 | 1910-08-25 |
| 1911 | 1911-05-21 | 1911-08-23 |
| 1912 | 1912-05-24 | 1912-10-07 |
| 1913 | 1913-06-07 | 1913-09-08 |
| 1914 | 1914-04-19 | 1914-09-24 |
| 1915 | 1915-06-29 | 1915-09-17 |
| 1916 | 1916-07-01 | 1916-09-27 |
| 1917 | 1917-06-20 | 1917-08-29 |
| 1918 | 1918-05-06 | 1918-08-24 |
| 1919 | 1919-05-05 | 1919-09-08 |
| 1920 | 1920-05-28 | 1920-08-16 |
| 1921 | 1921-05-21 | 1921-09-06 |
| 1922 | 1922-05-29 | 1922-10-05 |
| 1923 | 1923-04-21 | 1923-08-31 |
| 1924 | 1924-06-22 | 1924-09-02 |
| 1925 | 1925-06-01 | 1925-09-12 |
| 1926 | 1926-06-29 | 1926-09-25 |
| 1927 | 1927-04-20 | 1927-10-01 |
| 1928 | 1928-06-13 | 1928-10-12 |
| 1929 | 1929-05-28 | 1929-09-10 |
| 1930 | 1930-05-02 | 1930-10-13 |
| 1931 | 1931-05-28 | 1931-09-22 |
| 1932 | 1932-05-16 | 1932-09-06 |
| 1933 | 1933-05-19 | 1933-09-27 |
| 1934 | 1934-05-22 | 1934-08-10 |
| 1935 | 1935-06-29 | 1935-08-19 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 43 | 34 | 1929 | 14 |
| 35 C (95 F): Days | 27 | 8 | 1911 | 7 |
| 40 C (104 F): Days | 1 | 1 | 1911 | 1 |
| 90 F (32.2 C): Days | 43 | 19 | 1930 | 4 |
| 100 F (37.8 C): Days | 4 | 4 | 1911 | 1 |
| 0 C (32 F): Ice days (max | 43 | 57 | 1904 | 40 |
| 0 C (32 F): Frost days (min | 43 | 140 | 1904 | 105 |
| -10 C (14 F): Days with min | 43 | 46 | 1934 | 36 |
| -20 C (-4 F): Days with min | 20 | 3 | 1914 | 3 |
| 20 C (68 F): Tropical nights (min | 43 | 28 | 1930 | 19 |
| 25 C (77 F): Days with min | 7 | 4 | 1911 | 2 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 43 | 40 | 1913 | 28 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 43 | 15 | 1898 | 8 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 32 | 5 | 1932 | 1 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 5 | 1 | 1895 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 42 | 8 | 1916 | 1 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 10 | 2 | 1898 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts 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 2026-10-17 (17 October 2026). Threshold counts are computed by this site.
Data as of . Last revised (2025-12-31).