Fairfax Weather in December
Average highs run from 55°F on December 1 to 48°F on December 31, and lows from 30°F to 25°F. Normal precipitation for the month is 1.86 in over about 4 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
- 51°F
- Average low
- 27°F
- Precipitation
- 1.86 in
- Snowfall
- 2.4 in
- Record high
- 83°FDec 24, 2021
- Record low
- -10°FDec 22, 1989
- Chance of a freeze
- 100%
- Daylight
- 9 h 51 min to 9 h 42 min
- Cloud cover
- 56%
- Humidity
- 78%
- Dew point
- 30°F
- Wind
- 10.5 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 | 55°F | 30°F | 74°F 2012 | 4°F 2006 | 12% | 2% |
| Dec 2 | 55°F | 30°F | 78°F 2021 | 2°F 2006 | 12% | 2% |
| Dec 3 | 55°F | 30°F | 77°F 2012 | 12°F 2006 | 12% | 2% |
| Dec 4 | 54°F | 30°F | 76°F 2001 | 13°F 2009 | 12% | 2% |
| Dec 5 | 54°F | 29°F | 76°F 1975 | 8°F 1950 | 12% | 2% |
| Dec 6 | 54°F | 29°F | 67°F 1980 | 2°F 1950 | 12% | 2% |
| Dec 7 | 53°F | 29°F | 79°F 1966 | 1°F 1950 | 12% | 3% |
| Dec 8 | 53°F | 29°F | 71°F 2008 | -1°F 2005 | 12% | 3% |
| Dec 9 | 52°F | 28°F | 72°F 1996 | 0°F 2005 | 12% | 3% |
| Dec 10 | 52°F | 28°F | 76°F 1996 | 3°F 2013 | 12% | 3% |
| Dec 11 | 52°F | 28°F | 71°F 2015 | 4°F 1966 | 12% | 3% |
| Dec 12 | 52°F | 28°F | 71°F 2015 | 1°F 1962 | 12% | 3% |
| Dec 13 | 51°F | 27°F | 75°F 1948 | -2°F 1958 | 12% | 3% |
| Dec 14 | 51°F | 27°F | 76°F 2021 | -4°F 1958 | 12% | 3% |
| Dec 15 | 51°F | 27°F | 79°F 2021 | -5°F 1989 | 12% | 3% |
| Dec 16 | 50°F | 27°F | 71°F 2006 | 4°F 1987 | 12% | 3% |
| Dec 17 | 50°F | 27°F | 70°F 1962 | 3°F 1979 | 12% | 3% |
| Dec 18 | 50°F | 26°F | 71°F 2013 | -3°F 2016 | 12% | 3% |
| Dec 19 | 50°F | 26°F | 68°F 1978 | -4°F 1983 | 12% | 3% |
| Dec 20 | 50°F | 26°F | 68°F 1966 | -2°F 1983 | 12% | 3% |
| Dec 21 | 49°F | 26°F | 67°F 1957 | -3°F 1983 | 12% | 3% |
| Dec 22 | 49°F | 26°F | 71°F 2025 | -10°F 1989 | 12% | 3% |
| Dec 23 | 49°F | 26°F | 73°F 2025 | -9°F 1989 | 12% | 4% |
| Dec 24 | 49°F | 26°F | 83°F 2021 | -6°F 1983 | 12% | 4% |
| Dec 25 | 49°F | 25°F | 79°F 2025 | -5°F 1983 | 12% | 4% |
| Dec 26 | 49°F | 25°F | 79°F 2021 | -4°F 1962 | 12% | 4% |
| Dec 27 | 49°F | 25°F | 81°F 2025 | 7°F 1962 | 11% | 4% |
| Dec 28 | 48°F | 25°F | 72°F 1984 | 9°F 1950 | 11% | 4% |
| Dec 29 | 48°F | 25°F | 70°F 1984 | -9°F 1983 | 11% | 4% |
| Dec 30 | 48°F | 25°F | 71°F 2004 | -9°F 1983 | 11% | 4% |
| Dec 31 | 48°F | 25°F | 78°F 1951 | -2°F 1968 | 11% | 4% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CST).
- December 1
- sunrise 7:20 AM, sunset 5:11 PM
- December 31
- sunrise 7:39 AM, sunset 5:21 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00347390 (Ralston), public domain. Records: NOAA GHCN-Daily, station USW00013969, 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.