Fairfax Weather in January
Average highs run from 48°F on January 1 to 51°F on January 31, and lows from 25°F to 25°F. Normal precipitation for the month is 1.22 in over about 3 wet days.
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
- 49°F
- Average low
- 24°F
- Precipitation
- 1.22 in
- Snowfall
- 1.4 in
- Record high
- 80°FJan 28, 2015
- Record low
- -12°FJan 19, 1984
- Chance of a freeze
- 100%
- Daylight
- 9 h 43 min to 10 h 23 min
- Cloud cover
- 55%
- Humidity
- 77%
- Dew point
- 27°F
- Wind
- 11.0 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 | 48°F | 25°F | 77°F 2006 | -2°F 1979 | 11% | 4% |
| Jan 2 | 48°F | 24°F | 79°F 1997 | -2°F 1979 | 11% | 4% |
| Jan 3 | 48°F | 24°F | 78°F 1997 | -1°F 1959 | 11% | 4% |
| Jan 4 | 48°F | 24°F | 68°F 1956 | -7°F 1959 | 11% | 4% |
| Jan 5 | 48°F | 24°F | 73°F 2026 | -4°F 1959 | 11% | 4% |
| Jan 6 | 48°F | 24°F | 74°F 2008 | -3°F 2014 | 11% | 4% |
| Jan 7 | 48°F | 24°F | 73°F 2006 | 0°F 1968 | 11% | 4% |
| Jan 8 | 48°F | 24°F | 70°F 2006 | -11°F 1988 | 11% | 4% |
| Jan 9 | 48°F | 24°F | 73°F 2002 | -4°F 1977 | 11% | 4% |
| Jan 10 | 48°F | 24°F | 72°F 1990 | -9°F 1977 | 11% | 4% |
| Jan 11 | 48°F | 24°F | 72°F 2017 | -3°F 1973 | 10% | 4% |
| Jan 12 | 49°F | 24°F | 71°F 2014 | -5°F 1963 | 10% | 4% |
| Jan 13 | 49°F | 24°F | 73°F 1996 | -1°F 1963 | 10% | 4% |
| Jan 14 | 49°F | 24°F | 71°F 1996 | -4°F 1979 | 10% | 4% |
| Jan 15 | 49°F | 24°F | 70°F 1952 | -4°F 1972 | 10% | 4% |
| Jan 16 | 49°F | 24°F | 74°F 1952 | -1°F 2024 | 10% | 4% |
| Jan 17 | 49°F | 24°F | 66°F 1996 | -4°F 1978 | 10% | 4% |
| Jan 18 | 49°F | 24°F | 74°F 2015 | 3°F 1984 | 10% | 4% |
| Jan 19 | 49°F | 24°F | 72°F 1951 | -12°F 1984 | 10% | 4% |
| Jan 20 | 49°F | 24°F | 76°F 1986 | -7°F 1962 | 11% | 4% |
| Jan 21 | 49°F | 24°F | 71°F 1986 | -9°F 2025 | 11% | 4% |
| Jan 22 | 50°F | 24°F | 78°F 1967 | 2°F 1954 | 11% | 4% |
| Jan 23 | 50°F | 24°F | 71°F 1967 | -3°F 1963 | 11% | 4% |
| Jan 24 | 50°F | 24°F | 79°F 1950 | -2°F 1963 | 11% | 4% |
| Jan 25 | 50°F | 24°F | 74°F 1953 | -8°F 2026 | 11% | 4% |
| Jan 26 | 50°F | 24°F | 74°F 2015 | -8°F 2026 | 11% | 4% |
| Jan 27 | 50°F | 24°F | 76°F 2015 | -4°F 1963 | 11% | 4% |
| Jan 28 | 51°F | 24°F | 80°F 2015 | 0°F 1948 | 11% | 4% |
| Jan 29 | 51°F | 25°F | 76°F 2011 | -5°F 1949 | 11% | 4% |
| Jan 30 | 51°F | 25°F | 73°F 2017 | -8°F 1949 | 11% | 4% |
| Jan 31 | 51°F | 25°F | 73°F 1986 | -8°F 1979 | 11% | 4% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CST).
- January 1
- sunrise 7:39 AM, sunset 5:22 PM
- January 31
- sunrise 7:29 AM, sunset 5:52 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.