Merrimac Weather in December
Average highs run from 52°F on December 1 to 45°F on December 31, and lows from 33°F to 26°F. Normal precipitation for the month is 3.41 in over about 8 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
- 48°F
- Average low
- 29°F
- Precipitation
- 3.41 in
- Snowfall
- 3.2 in
- Record high
- 81°FDec 6, 2001
- Record low
- 4°FDec 24, 2022
- Chance of a freeze
- 100%
- Daylight
- 9 h 41 min to 9 h 32 min
- Cloud cover
- 61%
- Humidity
- 82%
- Dew point
- 30°F
- Wind
- 4.7 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 | 52°F | 33°F | 74°F 1998 | 21°F 2013 | 28% | 3% |
| Dec 2 | 51°F | 32°F | 74°F 2001 | 20°F 2002 | 28% | 3% |
| Dec 3 | 51°F | 32°F | 70°F 1998 | 14°F 2000 | 28% | 4% |
| Dec 4 | 51°F | 32°F | 75°F 1998 | 11°F 2002 | 28% | 4% |
| Dec 5 | 51°F | 32°F | 77°F 1998 | 11°F 2002 | 28% | 4% |
| Dec 6 | 50°F | 31°F | 81°F 2001 | 15°F 2008 | 28% | 4% |
| Dec 7 | 50°F | 31°F | 80°F 1998 | 9°F 2002 | 28% | 4% |
| Dec 8 | 50°F | 31°F | 80°F 1998 | 9°F 2002 | 27% | 4% |
| Dec 9 | 49°F | 31°F | 65°F 2004 | 10°F 2006 | 27% | 5% |
| Dec 10 | 49°F | 30°F | 58°F 1999 | 8°F 2006 | 27% | 5% |
| Dec 11 | 49°F | 30°F | 62°F 2008 | 16°F 1995 | 27% | 5% |
| Dec 12 | 49°F | 30°F | 69°F 2021 | 17°F 2013 | 27% | 5% |
| Dec 13 | 48°F | 30°F | 77°F 2015 | 16°F 2013 | 27% | 5% |
| Dec 14 | 48°F | 30°F | 65°F 2020 | 12°F 2000 | 27% | 5% |
| Dec 15 | 48°F | 29°F | 67°F 2001 | 12°F 2005 | 27% | 5% |
| Dec 16 | 48°F | 29°F | 66°F 2011 | 9°F 2016 | 27% | 6% |
| Dec 17 | 47°F | 29°F | 67°F 2021 | 14°F 2016 | 27% | 6% |
| Dec 18 | 47°F | 29°F | 69°F 2006 | 18°F 2007 | 27% | 6% |
| Dec 19 | 47°F | 28°F | 72°F 2006 | 17°F 2007 | 27% | 6% |
| Dec 20 | 47°F | 28°F | 65°F 2017 | 10°F 2004 | 27% | 6% |
| Dec 21 | 47°F | 28°F | 59°F 2002 | 9°F 1996 | 27% | 6% |
| Dec 22 | 46°F | 28°F | 70°F 2013 | 11°F 2000 | 27% | 6% |
| Dec 23 | 46°F | 28°F | 70°F 2013 | 9°F 2008 | 27% | 6% |
| Dec 24 | 46°F | 28°F | 65°F 2015 | 4°F 2022 | 27% | 6% |
| Dec 25 | 46°F | 27°F | 63°F 2008 | 11°F 1999 | 27% | 6% |
| Dec 26 | 46°F | 27°F | 71°F 2021 | 9°F 1999 | 27% | 6% |
| Dec 27 | 46°F | 27°F | 65°F 2021 | 11°F 2000 | 27% | 7% |
| Dec 28 | 45°F | 27°F | 69°F 2016 | 12°F 2017 | 27% | 7% |
| Dec 29 | 45°F | 27°F | 70°F 2008 | 11°F 2017 | 27% | 7% |
| Dec 30 | 45°F | 27°F | 70°F 1996 | 13°F 2000 | 27% | 7% |
| Dec 31 | 45°F | 26°F | 67°F 2019 | 15°F 2017 | 27% | 7% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (EST).
- December 1
- sunrise 7:11 AM, sunset 4:52 PM
- December 31
- sunrise 7:29 AM, sunset 5:01 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00446712 (Piedmont Rsch Stn), public domain. Records: NOAA GHCN-Daily, station USC00447985, 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.