Potomac Weather in January
Average highs run from 44°F on January 1 to 44°F on January 31, and lows from 27°F to 25°F. Normal precipitation for the month is 3.32 in over about 10 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
- 43°F
- Average low
- 26°F
- Precipitation
- 3.32 in
- Snowfall
- 2.9 in
- Record high
- 78°FJan 26, 1950
- Record low
- -13°FJan 21, 1985
- Chance of a freeze
- 100%
- Daylight
- 9 h 29 min to 10 h 13 min
- Cloud cover
- 64%
- Humidity
- 83%
- Dew point
- 27°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 |
|---|---|---|---|---|---|---|
| Jan 1 | 44°F | 27°F | 67°F 1966 | -9°F 1918 | 34% | 3% |
| Jan 2 | 43°F | 27°F | 69°F 1916 | 7°F 1918 | 34% | 3% |
| Jan 3 | 43°F | 27°F | 70°F 2000 | -2°F 1918 | 34% | 3% |
| Jan 4 | 43°F | 26°F | 71°F 1997 | -12°F 1918 | 33% | 3% |
| Jan 5 | 43°F | 26°F | 68°F 1950 | 6°F 1912 | 33% | 3% |
| Jan 6 | 43°F | 26°F | 70°F 1950 | 2°F 1981 | 33% | 4% |
| Jan 7 | 43°F | 26°F | 70°F 1950 | 9°F 1912 | 33% | 4% |
| Jan 8 | 43°F | 26°F | 70°F 1998 | 4°F 1968 | 33% | 4% |
| Jan 9 | 43°F | 26°F | 62°F 1998 | 5°F 1968 | 33% | 4% |
| Jan 10 | 43°F | 26°F | 69°F 1950 | 1°F 1982 | 33% | 4% |
| Jan 11 | 43°F | 26°F | 73°F 1975 | 0°F 1982 | 33% | 4% |
| Jan 12 | 43°F | 25°F | 72°F 1975 | 1°F 1977 | 33% | 4% |
| Jan 13 | 43°F | 25°F | 69°F 1995 | -6°F 1912 | 33% | 4% |
| Jan 14 | 43°F | 25°F | 71°F 1995 | -10°F 1912 | 33% | 4% |
| Jan 15 | 43°F | 25°F | 73°F 1952 | 4°F 1994 | 33% | 4% |
| Jan 16 | 43°F | 25°F | 72°F 1952 | -1°F 1972 | 33% | 4% |
| Jan 17 | 43°F | 25°F | 67°F 1913 | -6°F 1982 | 33% | 4% |
| Jan 18 | 43°F | 25°F | 70°F 1986 | -10°F 1982 | 33% | 5% |
| Jan 19 | 43°F | 25°F | 71°F 1951 | -7°F 1994 | 33% | 5% |
| Jan 20 | 43°F | 25°F | 71°F 1951 | -10°F 1985 | 32% | 5% |
| Jan 21 | 43°F | 25°F | 67°F 1951 | -13°F 1985 | 32% | 5% |
| Jan 22 | 43°F | 25°F | 70°F 1986 | 2°F 1961 | 32% | 5% |
| Jan 23 | 43°F | 25°F | 72°F 1967 | 2°F 1978 | 32% | 5% |
| Jan 24 | 43°F | 25°F | 73°F 1967 | 0°F 1963 | 32% | 5% |
| Jan 25 | 43°F | 25°F | 75°F 1950 | 3°F 1961 | 32% | 5% |
| Jan 26 | 43°F | 25°F | 78°F 1950 | 4°F 1982 | 32% | 5% |
| Jan 27 | 43°F | 25°F | 77°F 1950 | 0°F 1982 | 32% | 5% |
| Jan 28 | 43°F | 25°F | 70°F 1949 | -4°F 1987 | 32% | 5% |
| Jan 29 | 44°F | 25°F | 75°F 1975 | 2°F 1977 | 32% | 5% |
| Jan 30 | 44°F | 25°F | 74°F 1914 | 6°F 1966 | 32% | 5% |
| Jan 31 | 44°F | 25°F | 71°F 1916 | 6°F 1966 | 32% | 5% |
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 4:57 PM
- January 31
- sunrise 7:16 AM, sunset 5:29 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00182325 (Dalecarlia Rsvr), public domain. Records: NOAA GHCN-Daily, station USC00187705, 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.