Fairfax Weather in December
Average highs run from 34°F on December 1 to 23°F on December 31, and lows from 18°F to 6°F. Normal precipitation for the month is 0.95 in over about 5 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
- 28°F
- Average low
- 12°F
- Precipitation
- 0.95 in
- Snowfall
- 9.4 in
- Record high
- 70°FDec 6, 1939
- Record low
- -31°FDec 29, 1917
- Chance of a freeze
- 100%
- Daylight
- 9 h 05 min to 8 h 54 min
- Cloud cover
- 65%
- Humidity
- 86%
- Dew point
- 16°F
- Wind
- 11.4 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 | 34°F | 18°F | 64°F 1998 | -8°F 1919 | 16% | 10% |
| Dec 2 | 34°F | 17°F | 59°F 1982 | -18°F 1985 | 16% | 10% |
| Dec 3 | 33°F | 17°F | 62°F 1998 | -18°F 1985 | 17% | 11% |
| Dec 4 | 33°F | 17°F | 55°F 1941 | -13°F 1991 | 17% | 11% |
| Dec 5 | 32°F | 16°F | 56°F 1939 | -9°F 2005 | 17% | 11% |
| Dec 6 | 32°F | 16°F | 70°F 1939 | -20°F 1972 | 17% | 11% |
| Dec 7 | 31°F | 15°F | 58°F 2023 | -15°F 1936 | 17% | 12% |
| Dec 8 | 31°F | 15°F | 59°F 1915 | -18°F 1976 | 17% | 12% |
| Dec 9 | 31°F | 14°F | 63°F 1939 | -20°F 1955 | 17% | 12% |
| Dec 10 | 30°F | 14°F | 58°F 1939 | -20°F 1917 | 17% | 12% |
| Dec 11 | 30°F | 14°F | 54°F 1939 | -17°F 1955 | 17% | 13% |
| Dec 12 | 29°F | 13°F | 51°F 1980 | -16°F 2000 | 17% | 13% |
| Dec 13 | 29°F | 13°F | 56°F 2014 | -30°F 1917 | 17% | 13% |
| Dec 14 | 28°F | 12°F | 56°F 1998 | -19°F 1917 | 17% | 13% |
| Dec 15 | 28°F | 12°F | 58°F 1939 | -18°F 1919 | 17% | 13% |
| Dec 16 | 27°F | 11°F | 61°F 1939 | -21°F 1953 | 17% | 13% |
| Dec 17 | 27°F | 11°F | 58°F 1939 | -20°F 1953 | 17% | 14% |
| Dec 18 | 27°F | 11°F | 52°F 1939 | -30°F 2016 | 17% | 14% |
| Dec 19 | 26°F | 10°F | 51°F 1988 | -29°F 1983 | 17% | 14% |
| Dec 20 | 26°F | 10°F | 47°F 1979 | -28°F 1916 | 17% | 14% |
| Dec 21 | 26°F | 9°F | 52°F 1933 | -29°F 1916 | 17% | 14% |
| Dec 22 | 25°F | 9°F | 56°F 2020 | -28°F 1916 | 17% | 15% |
| Dec 23 | 25°F | 9°F | 46°F 2023 | -25°F 1983 | 17% | 15% |
| Dec 24 | 25°F | 8°F | 51°F 2023 | -23°F 1983 | 17% | 15% |
| Dec 25 | 24°F | 8°F | 51°F 2023 | -18°F 2000 | 17% | 15% |
| Dec 26 | 24°F | 8°F | 53°F 2011 | -27°F 1914 | 17% | 15% |
| Dec 27 | 24°F | 7°F | 48°F 1928 | -25°F 1950 | 17% | 15% |
| Dec 28 | 23°F | 7°F | 50°F 2024 | -24°F 1993 | 17% | 15% |
| Dec 29 | 23°F | 7°F | 60°F 1999 | -31°F 1917 | 17% | 15% |
| Dec 30 | 23°F | 6°F | 58°F 2004 | -21°F 1976 | 17% | 16% |
| Dec 31 | 23°F | 6°F | 49°F 1999 | -24°F 1973 | 17% | 16% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CST).
- December 1
- sunrise 7:35 AM, sunset 4:40 PM
- December 31
- sunrise 7:55 AM, sunset 4:49 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00216839 (Redwood Falls), public domain. Records: NOAA GHCN-Daily, station USW00014992, 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.