Somerville Threshold Days by Year
16 fixed thresholds counted per year at Somerville (USC00418445): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Somerville Thresholds
- Somerville: days with 10 mm (0.39 in) or more of precipitation in 14 years, most in 1919 with 47.
- Somerville: days with 25 mm (0.98 in) or more of precipitation in 14 years, most in 1919 with 21.
- Somerville: days with a maximum temperature at or above 30 C (86 F) in 12 years, most in 1916 with 169.
- Somerville: days with a maximum temperature at or above 35 C (95 F) in 12 years, most in 1912 with 90.
- 16 fixed thresholds have at least one qualifying day at Somerville.
Days at or above 30 C (86 F)
12 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1912 | 148 | 143.4 |
| 1913 | 137 | 143.4 |
| 1914 | 103 | 143.4 |
| 1915 | 152 | 143.4 |
| 1916 | 169 | 143.4 |
| 1917 | 160 | 143.4 |
| 1918 | 150 | 143.4 |
| 1919 | 128 | 143.4 |
| 1920 | 151 | 157.8 |
| 1921 | 156 | 157.8 |
| 1922 | 157 | 157.8 |
| 1923 | 167 | 157.8 |
| Year | First date | Last date |
|---|---|---|
| 1912 | 1912-04-21 | 1912-10-29 |
| 1913 | 1913-03-30 | 1913-10-11 |
| 1914 | 1914-04-15 | 1914-10-10 |
| 1915 | 1915-04-29 | 1915-11-08 |
| 1916 | 1916-03-01 | 1916-11-05 |
| 1917 | 1917-02-21 | 1917-10-28 |
| 1918 | 1918-03-11 | 1918-11-07 |
| 1919 | 1919-04-12 | 1919-10-31 |
| 1920 | 1920-03-29 | 1920-10-14 |
| 1921 | 1921-03-24 | 1921-12-13 |
| 1922 | 1922-04-05 | 1922-12-03 |
| 1923 | 1923-03-03 | 1923-10-14 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 12 | 169 | 1916 | 167 |
| 35 C (95 F): Days | 12 | 90 | 1912 | 74 |
| 40 C (104 F): Days | 7 | 5 | 1917 | 1 |
| 90 F (32.2 C): Days | 12 | 138 | 1916 | 136 |
| 100 F (37.8 C): Days | 11 | 40 | 1918 | 31 |
| 110 F (43.3 C): Days | 1 | 1 | 1917 | 1 |
| 0 C (32 F): Ice days (max | 4 | 1 | 1912 | 1 |
| 0 C (32 F): Frost days (min | 12 | 34 | 1912 | 13 |
| -10 C (14 F): Days with min | 3 | 3 | 1918 | 3 |
| 20 C (68 F): Tropical nights (min | 12 | 139 | 1914 | 131 |
| 25 C (77 F): Days with min | 11 | 12 | 1915 | 6 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 14 | 47 | 1919 | 24 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 14 | 21 | 1919 | 13 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 12 | 6 | 1914 | 3 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 6 | 3 | 1913 | 1 |
| 200 mm (7.87 in): Days with 200 mm or more rain | 1 | 1 | 1913 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1912.
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). Threshold counts are computed by this site.
Data as of . Last revised (2025-12-31).