Acton Weather in December
Average highs run from 42°F on December 1 to 33°F on December 31, and lows from 22°F to 13°F. Normal precipitation for the month is 4.79 in over about 11 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
- 37°F
- Average low
- 17°F
- Precipitation
- 4.79 in
- Snowfall
- 17.7 in
- Record high
- 73°FDec 7, 1998
- Record low
- -20°FDec 31, 1963
- Chance of a freeze
- 100%
- Daylight
- 9 h 11 min to 9 h 00 min
- Cloud cover
- 65%
- Humidity
- 88%
- Dew point
- 22°F
- Wind
- 5.6 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| Dec 1 | 42°F | 22°F | 64°F 2001 | 8°F 1974 | 36% | 16% |
| Dec 2 | 42°F | 22°F | 67°F 1998 | 0°F 1989 | 36% | 17% |
| Dec 3 | 41°F | 21°F | 66°F 2009 | -1°F 1976 | 36% | 17% |
| Dec 4 | 41°F | 21°F | 70°F 1998 | 1°F 1966 | 36% | 18% |
| Dec 5 | 41°F | 21°F | 64°F 1982 | 1°F 1971 | 36% | 18% |
| Dec 6 | 40°F | 20°F | 70°F 2001 | 4°F 1971 | 37% | 19% |
| Dec 7 | 40°F | 20°F | 73°F 1998 | -1°F 1955 | 37% | 19% |
| Dec 8 | 40°F | 20°F | 55°F 1953 | -5°F 1964 | 37% | 20% |
| Dec 9 | 39°F | 19°F | 60°F 1998 | -7°F 1989 | 37% | 20% |
| Dec 10 | 39°F | 19°F | 58°F 1953 | -5°F 1958 | 37% | 20% |
| Dec 11 | 39°F | 19°F | 58°F 1966 | -9°F 1958 | 37% | 21% |
| Dec 12 | 38°F | 19°F | 65°F 1979 | -10°F 1977 | 37% | 21% |
| Dec 13 | 38°F | 18°F | 60°F 1979 | -4°F 1960 | 37% | 21% |
| Dec 14 | 38°F | 18°F | 54°F 2006 | -8°F 2013 | 37% | 22% |
| Dec 15 | 37°F | 18°F | 58°F 2008 | -6°F 1960 | 37% | 22% |
| Dec 16 | 37°F | 17°F | 58°F 2008 | -4°F 2016 | 37% | 22% |
| Dec 17 | 37°F | 17°F | 56°F 1984 | -11°F 1972 | 37% | 23% |
| Dec 18 | 36°F | 17°F | 57°F 2000 | -9°F 1972 | 37% | 23% |
| Dec 19 | 36°F | 16°F | 58°F 2023 | -8°F 1971 | 37% | 23% |
| Dec 20 | 36°F | 16°F | 58°F 2023 | -18°F 1980 | 36% | 24% |
| Dec 21 | 36°F | 16°F | 59°F 1957 | -14°F 1980 | 36% | 24% |
| Dec 22 | 35°F | 15°F | 62°F 1994 | -16°F 1970 | 36% | 24% |
| Dec 23 | 35°F | 15°F | 65°F 1990 | -14°F 1989 | 36% | 24% |
| Dec 24 | 35°F | 15°F | 58°F 1990 | -15°F 1989 | 36% | 25% |
| Dec 25 | 35°F | 15°F | 56°F 1994 | -13°F 1975 | 36% | 25% |
| Dec 26 | 34°F | 14°F | 61°F 2015 | -18°F 1980 | 36% | 25% |
| Dec 27 | 34°F | 14°F | 56°F 1964 | -9°F 2017 | 36% | 25% |
| Dec 28 | 34°F | 14°F | 55°F 2008 | -17°F 1960 | 36% | 26% |
| Dec 29 | 34°F | 13°F | 60°F 1982 | -16°F 2017 | 36% | 26% |
| Dec 30 | 33°F | 13°F | 55°F 1984 | -17°F 2017 | 36% | 26% |
| Dec 31 | 33°F | 13°F | 59°F 2022 | -20°F 1963 | 36% | 26% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (EST).
- December 1
- sunrise 6:57 AM, sunset 4:08 PM
- December 31
- sunrise 7:17 AM, sunset 4:17 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00177479 (Sanford 2 Nnw), public domain. Records: NOAA GHCN-Daily, station USC00177479, 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.