Somerville Weather in December
Average highs run from 68°F on December 1 to 62°F on December 31, and lows from 40°F to 34°F. Normal precipitation for the month is 3.65 in over about 10 wet days.
December day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
December at a glance
- Average high
- 64°F
- Average low
- 37°F
- Precipitation
- 3.65 in
- Record high
- 87°FDec 4, 1928
- Record low
- 4°FDec 23, 1989
- Chance of a freeze
- 99%
- Daylight
- 10 h 20 min to 10 h 13 min
- Cloud cover
- 59%
- Humidity
- 80%
- Dew point
- 44°F
- Wind
- 8.7 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Dec 1 | 68°F | 40°F | 84°F 1950 | 25°F 1911 | 29% |
| Dec 2 | 67°F | 40°F | 82°F 1917 | 27°F 1929 | 29% |
| Dec 3 | 67°F | 40°F | 83°F 1950 | 18°F 1929 | 29% |
| Dec 4 | 67°F | 39°F | 87°F 1928 | 21°F 1929 | 30% |
| Dec 5 | 67°F | 39°F | 85°F 1933 | 23°F 2009 | 30% |
| Dec 6 | 66°F | 39°F | 83°F 1956 | 18°F 1950 | 30% |
| Dec 7 | 66°F | 39°F | 83°F 1951 | 18°F 1950 | 30% |
| Dec 8 | 66°F | 38°F | 84°F 1956 | 20°F 1927 | 31% |
| Dec 9 | 66°F | 38°F | 85°F 1929 | 20°F 1917 | 31% |
| Dec 10 | 65°F | 38°F | 82°F 1938 | 22°F 1978 | 31% |
| Dec 11 | 65°F | 38°F | 84°F 1929 | 21°F 1978 | 31% |
| Dec 12 | 65°F | 37°F | 85°F 1929 | 20°F 1957 | 31% |
| Dec 13 | 65°F | 37°F | 86°F 1927 | 21°F 1957 | 31% |
| Dec 14 | 65°F | 37°F | 83°F 1933 | 21°F 1919 | 32% |
| Dec 15 | 64°F | 37°F | 82°F 1975 | 16°F 1901 | 32% |
| Dec 16 | 64°F | 37°F | 84°F 1933 | 14°F 1989 | 32% |
| Dec 17 | 64°F | 36°F | 82°F 1929 | 19°F 1943 | 32% |
| Dec 18 | 64°F | 36°F | 80°F 1924 | 20°F 1943 | 32% |
| Dec 19 | 64°F | 36°F | 80°F 2012 | 14°F 1929 | 32% |
| Dec 20 | 64°F | 36°F | 80°F 1933 | 15°F 1929 | 32% |
| Dec 21 | 63°F | 36°F | 80°F 1933 | 18°F 1924 | 32% |
| Dec 22 | 63°F | 35°F | 83°F 1933 | 12°F 1989 | 32% |
| Dec 23 | 63°F | 35°F | 82°F 1933 | 4°F 1989 | 32% |
| Dec 24 | 63°F | 35°F | 83°F 1933 | 13°F 1929 | 32% |
| Dec 25 | 63°F | 35°F | 84°F 1948 | 9°F 1983 | 32% |
| Dec 26 | 63°F | 35°F | 84°F 1955 | 10°F 1983 | 32% |
| Dec 27 | 63°F | 35°F | 82°F 2025 | 19°F 1983 | 32% |
| Dec 28 | 63°F | 35°F | 83°F 1971 | 17°F 1925 | 32% |
| Dec 29 | 62°F | 35°F | 82°F 2025 | 18°F 1983 | 32% |
| Dec 30 | 62°F | 34°F | 83°F 1927 | 15°F 1983 | 32% |
| Dec 31 | 62°F | 34°F | 84°F 1929 | 15°F 1983 | 32% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (CST).
- December 1
- sunrise 7:05 AM, sunset 5:25 PM
- December 31
- sunrise 7:23 AM, sunset 5:36 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00418446 (Somerville Dam), public domain. Records: NOAA GHCN-Daily, station USC00411048, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.