Fairfax Weather in January
Average highs run from 34°F on January 1 to 34°F on January 31, and lows from 16°F to 15°F.
January day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
January at a glance
- Average high
- 33°F
- Average low
- 15°F
- Snowfall
- 7.7 in
- Record high
- 72°FJan 28, 2015
- Record low
- -30°FJan 13, 1916
- Chance of a freeze
- 100%
- Daylight
- 9 h 22 min to 10 h 07 min
- Cloud cover
- 63%
- Humidity
- 81%
- Dew point
- 19°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 |
|---|---|---|---|---|---|---|
| Jan 1 | 34°F | 16°F | 62°F 1939 | -17°F 2018 | 14% | |
| Jan 2 | 34°F | 16°F | 66°F 1964 | -13°F 2018 | 14% | |
| Jan 3 | 34°F | 16°F | 64°F 1997 | -19°F 1919 | 15% | |
| Jan 4 | 34°F | 16°F | 63°F 1916 | -28°F 1947 | 15% | |
| Jan 5 | 34°F | 15°F | 70°F 1956 | -24°F 1924 | 15% | |
| Jan 6 | 34°F | 15°F | 61°F 1939 | -11°F 1971 | 15% | |
| Jan 7 | 34°F | 15°F | 67°F 2026 | -14°F 1968 | 15% | |
| Jan 8 | 33°F | 15°F | 70°F 2003 | -11°F 1913 | 15% | |
| Jan 9 | 33°F | 15°F | 62°F 2018 | -11°F 1977 | 15% | |
| Jan 10 | 33°F | 15°F | 68°F 1928 | -8°F 1978 | 15% | |
| Jan 11 | 33°F | 15°F | 63°F 1990 | -19°F 1918 | 15% | |
| Jan 12 | 33°F | 15°F | 63°F 1928 | -20°F 1918 | 15% | |
| Jan 13 | 33°F | 15°F | 61°F 1923 | -30°F 1916 | 15% | |
| Jan 14 | 33°F | 15°F | 65°F 1952 | -14°F 1916 | 15% | |
| Jan 15 | 33°F | 15°F | 63°F 2006 | -13°F 1927 | 15% | |
| Jan 16 | 33°F | 15°F | 67°F 1952 | -13°F 1977 | 16% | |
| Jan 17 | 33°F | 15°F | 66°F 1990 | -12°F 1930 | 16% | |
| Jan 18 | 33°F | 15°F | 69°F 1951 | -20°F 1930 | 16% | |
| Jan 19 | 33°F | 15°F | 66°F 1914 | -17°F 1943 | 16% | |
| Jan 20 | 33°F | 15°F | 62°F 1921 | -15°F 1936 | 16% | |
| Jan 21 | 33°F | 15°F | 66°F 1997 | -15°F 1930 | 16% | |
| Jan 22 | 33°F | 15°F | 64°F 2002 | -28°F 1930 | 16% | |
| Jan 23 | 33°F | 15°F | 67°F 1981 | -23°F 1948 | 16% | |
| Jan 24 | 33°F | 15°F | 71°F 1981 | -18°F 1936 | 16% | |
| Jan 25 | 33°F | 15°F | 66°F 1944 | -20°F 1936 | 16% | |
| Jan 26 | 33°F | 15°F | 67°F 2002 | -23°F 1936 | 16% | |
| Jan 27 | 33°F | 15°F | 67°F 1934 | -18°F 1940 | 16% | |
| Jan 28 | 34°F | 15°F | 72°F 2015 | -21°F 1915 | 16% | |
| Jan 29 | 34°F | 15°F | 65°F 1919 | -16°F 1966 | 16% | |
| Jan 30 | 34°F | 15°F | 70°F 2012 | -22°F 1936 | 16% | |
| Jan 31 | 34°F | 15°F | 68°F 2009 | -16°F 1918 | 16% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CST).
- January 1
- sunrise 7:44 AM, sunset 5:06 PM
- January 31
- sunrise 7:32 AM, sunset 5:39 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00014945 (Tarkio), public domain. Records: NOAA GHCN-Daily, station USW00094957, 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.