Mount Vernon Weather in January
Average highs run from 39°F on January 1 to 42°F on January 31, and lows from 20°F to 22°F. Normal precipitation for the month is 1.09 in over about 11 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
- 40°F
- Average low
- 21°F
- Precipitation
- 1.09 in
- Snowfall
- 3.5 in
- Record high
- 69°FJan 1, 1904
- Record low
- -24°FJan 27, 1957
- Chance of a freeze
- 100%
- Daylight
- 8 h 55 min to 9 h 49 min
- Cloud cover
- 69%
- Humidity
- 90%
- Dew point
- 23°F
- Wind
- 5.6 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 | 39°F | 20°F | 69°F 1904 | -13°F 1979 | 35% | 9% |
| Jan 2 | 39°F | 20°F | 61°F 1964 | -8°F 1979 | 35% | 9% |
| Jan 3 | 39°F | 20°F | 59°F 1954 | -5°F 1959 | 35% | 9% |
| Jan 4 | 39°F | 20°F | 54°F 2012 | -4°F 1959 | 35% | 9% |
| Jan 5 | 39°F | 21°F | 61°F 2012 | -6°F 1977 | 35% | 9% |
| Jan 6 | 39°F | 21°F | 58°F 1969 | -16°F 1979 | 35% | 9% |
| Jan 7 | 39°F | 21°F | 57°F 1969 | -16°F 1979 | 35% | 10% |
| Jan 8 | 39°F | 21°F | 62°F 2002 | -16°F 1979 | 35% | 10% |
| Jan 9 | 40°F | 21°F | 55°F 1959 | -4°F 1977 | 35% | 10% |
| Jan 10 | 40°F | 21°F | 60°F 1959 | -2°F 1974 | 35% | 10% |
| Jan 11 | 40°F | 21°F | 62°F 1959 | -8°F 1963 | 35% | 10% |
| Jan 12 | 40°F | 21°F | 60°F 1959 | -10°F 1963 | 35% | 10% |
| Jan 13 | 40°F | 21°F | 58°F 1980 | -5°F 1963 | 35% | 10% |
| Jan 14 | 40°F | 21°F | 62°F 1986 | 0°F 1960 | 35% | 10% |
| Jan 15 | 40°F | 21°F | 59°F 1973 | 3°F 2017 | 35% | 10% |
| Jan 16 | 40°F | 21°F | 62°F 1974 | -11°F 1987 | 35% | 10% |
| Jan 17 | 40°F | 21°F | 58°F 2009 | -1°F 1957 | 35% | 9% |
| Jan 18 | 41°F | 21°F | 61°F 1959 | -6°F 1960 | 35% | 9% |
| Jan 19 | 41°F | 22°F | 60°F 1986 | -4°F 1960 | 35% | 9% |
| Jan 20 | 41°F | 22°F | 61°F 1971 | -3°F 1987 | 34% | 9% |
| Jan 21 | 41°F | 22°F | 62°F 1981 | -23°F 1962 | 34% | 9% |
| Jan 22 | 41°F | 22°F | 61°F 1954 | -22°F 1962 | 34% | 9% |
| Jan 23 | 41°F | 22°F | 66°F 1981 | -19°F 1962 | 34% | 9% |
| Jan 24 | 41°F | 22°F | 65°F 1905 | -4°F 1962 | 34% | 9% |
| Jan 25 | 41°F | 22°F | 60°F 2005 | -10°F 1957 | 34% | 9% |
| Jan 26 | 41°F | 22°F | 63°F 2015 | -11°F 1957 | 33% | 9% |
| Jan 27 | 42°F | 22°F | 65°F 2015 | -24°F 1957 | 33% | 9% |
| Jan 28 | 42°F | 22°F | 61°F 1987 | -18°F 1957 | 33% | 9% |
| Jan 29 | 42°F | 22°F | 61°F 1976 | -16°F 1957 | 33% | 8% |
| Jan 30 | 42°F | 22°F | 65°F 1954 | -10°F 1957 | 33% | 8% |
| Jan 31 | 42°F | 22°F | 60°F 1992 | -12°F 1956 | 33% | 8% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (PST).
- January 1
- sunrise 7:33 AM, sunset 4:28 PM
- January 31
- sunrise 7:16 AM, sunset 5:05 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00354291 (John Day), public domain. Records: NOAA GHCN-Daily, station USC00354291, 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.