Fairfax County Weather in January
Average highs run from 43°F on January 1 to 43°F on January 31, and lows from 26°F to 22°F. Normal precipitation for the month is 3.28 in over about 12 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
- 42°F
- Average low
- 23°F
- Precipitation
- 3.28 in
- Snowfall
- 6.5 in
- Record high
- 80°FJan 26, 2024
- Record low
- -5°FJan 17, 1982
- Chance of a freeze
- 100%
- Daylight
- 9 h 30 min to 10 h 14 min
- Cloud cover
- 65%
- Humidity
- 83%
- Dew point
- 26°F
- Wind
- 8.7 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 |
|---|---|---|---|---|---|---|
| Jan 1 | 43°F | 26°F | 69°F 2005 | 12°F 1963 | 36% | 6% |
| Jan 2 | 43°F | 25°F | 68°F 2000 | 8°F 1968 | 36% | 6% |
| Jan 3 | 43°F | 25°F | 69°F 2023 | 10°F 1979 | 37% | 6% |
| Jan 4 | 43°F | 25°F | 73°F 1997 | 13°F 1981 | 37% | 6% |
| Jan 5 | 42°F | 25°F | 71°F 1997 | 11°F 1968 | 37% | 6% |
| Jan 6 | 42°F | 25°F | 73°F 2007 | 11°F 1959 | 37% | 7% |
| Jan 7 | 42°F | 25°F | 69°F 2008 | 6°F 2014 | 37% | 7% |
| Jan 8 | 42°F | 24°F | 73°F 2008 | 7°F 1942 | 37% | 7% |
| Jan 9 | 42°F | 24°F | 68°F 2008 | 4°F 1970 | 37% | 7% |
| Jan 10 | 42°F | 24°F | 70°F 1950 | 2°F 1982 | 37% | 7% |
| Jan 11 | 42°F | 24°F | 75°F 1975 | 2°F 1982 | 37% | 8% |
| Jan 12 | 42°F | 24°F | 72°F 2017 | 7°F 1968 | 37% | 8% |
| Jan 13 | 42°F | 24°F | 71°F 2005 | 9°F 1977 | 37% | 8% |
| Jan 14 | 42°F | 23°F | 70°F 1995 | 12°F 1964 | 37% | 8% |
| Jan 15 | 42°F | 23°F | 74°F 1952 | 6°F 1994 | 37% | 8% |
| Jan 16 | 42°F | 23°F | 73°F 1953 | 3°F 1972 | 37% | 8% |
| Jan 17 | 42°F | 23°F | 72°F 1943 | -5°F 1982 | 37% | 8% |
| Jan 18 | 42°F | 23°F | 69°F 1990 | 2°F 1994 | 37% | 9% |
| Jan 19 | 42°F | 23°F | 71°F 1951 | -4°F 1994 | 37% | 9% |
| Jan 20 | 42°F | 23°F | 70°F 1951 | -2°F 1985 | 37% | 9% |
| Jan 21 | 42°F | 23°F | 70°F 1959 | -4°F 1985 | 37% | 9% |
| Jan 22 | 42°F | 23°F | 66°F 1986 | 3°F 1984 | 36% | 9% |
| Jan 23 | 42°F | 22°F | 72°F 1974 | 12°F 2014 | 36% | 9% |
| Jan 24 | 42°F | 22°F | 73°F 1950 | 3°F 1963 | 36% | 10% |
| Jan 25 | 42°F | 22°F | 75°F 1950 | 8°F 1961 | 36% | 10% |
| Jan 26 | 43°F | 22°F | 80°F 2024 | 5°F 1948 | 36% | 10% |
| Jan 27 | 43°F | 22°F | 75°F 1974 | 9°F 1987 | 36% | 10% |
| Jan 28 | 43°F | 22°F | 73°F 1949 | 6°F 1961 | 36% | 10% |
| Jan 29 | 43°F | 22°F | 76°F 1975 | 5°F 1961 | 35% | 10% |
| Jan 30 | 43°F | 22°F | 77°F 2002 | 11°F 1966 | 35% | 10% |
| Jan 31 | 43°F | 22°F | 70°F 1947 | 6°F 1948 | 35% | 10% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (EST).
- January 1
- sunrise 7:28 AM, sunset 4:58 PM
- January 31
- sunrise 7:16 AM, sunset 5:30 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00448737 (Vienna), public domain. Records: NOAA GHCN-Daily, station USW00013743, 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.