Union Weather in January
Average highs run from 38°F on January 1 to 41°F on January 31, and lows from 24°F to 26°F. Normal precipitation for the month is 1.19 in over about 13 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
- 25°F
- Precipitation
- 1.19 in
- Snowfall
- 5.3 in
- Record high
- 61°FJan 31, 1971
- Record low
- -17°FJan 31, 1996
- Chance of a freeze
- 100%
- Daylight
- 8 h 49 min to 9 h 45 min
- Cloud cover
- 70%
- Humidity
- 95%
- Dew point
- 21°F
- Wind
- 6.0 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 | 38°F | 24°F | 54°F 1997 | -12°F 1979 | 42% | 17% |
| Jan 2 | 38°F | 24°F | 53°F 1997 | -11°F 1991 | 42% | 17% |
| Jan 3 | 38°F | 24°F | 50°F 2026 | -3°F 1974 | 42% | 17% |
| Jan 4 | 38°F | 24°F | 54°F 2026 | -8°F 2004 | 42% | 17% |
| Jan 5 | 38°F | 25°F | 54°F 2026 | -9°F 2004 | 42% | 17% |
| Jan 6 | 39°F | 25°F | 51°F 1999 | -14°F 1974 | 42% | 17% |
| Jan 7 | 39°F | 25°F | 52°F 2022 | -13°F 1974 | 42% | 17% |
| Jan 8 | 39°F | 25°F | 53°F 2015 | -6°F 1974 | 42% | 17% |
| Jan 9 | 39°F | 25°F | 52°F 2002 | -11°F 1974 | 42% | 17% |
| Jan 10 | 39°F | 25°F | 58°F 1990 | -6°F 1974 | 41% | 17% |
| Jan 11 | 39°F | 25°F | 53°F 1983 | 3°F 1985 | 41% | 17% |
| Jan 12 | 39°F | 25°F | 54°F 1980 | 4°F 1993 | 41% | 17% |
| Jan 13 | 39°F | 25°F | 53°F 1974 | -11°F 2024 | 41% | 17% |
| Jan 14 | 39°F | 25°F | 52°F 1996 | -2°F 2017 | 41% | 16% |
| Jan 15 | 39°F | 25°F | 57°F 1974 | -5°F 2017 | 40% | 16% |
| Jan 16 | 39°F | 26°F | 57°F 1974 | -9°F 2024 | 40% | 16% |
| Jan 17 | 40°F | 26°F | 51°F 1974 | -5°F 2017 | 40% | 16% |
| Jan 18 | 40°F | 26°F | 52°F 1981 | 3°F 1979 | 39% | 16% |
| Jan 19 | 40°F | 26°F | 53°F 1981 | 6°F 1984 | 39% | 16% |
| Jan 20 | 40°F | 26°F | 54°F 1968 | 2°F 1987 | 39% | 15% |
| Jan 21 | 40°F | 26°F | 52°F 1981 | 3°F 1966 | 39% | 15% |
| Jan 22 | 40°F | 26°F | 56°F 1981 | -4°F 2008 | 38% | 15% |
| Jan 23 | 40°F | 26°F | 56°F 1981 | -4°F 2008 | 38% | 15% |
| Jan 24 | 40°F | 26°F | 51°F 2024 | -1°F 1989 | 38% | 14% |
| Jan 25 | 40°F | 26°F | 53°F 1992 | 1°F 1989 | 37% | 14% |
| Jan 26 | 41°F | 26°F | 55°F 1992 | 7°F 1989 | 37% | 14% |
| Jan 27 | 41°F | 26°F | 56°F 2015 | -3°F 1972 | 37% | 14% |
| Jan 28 | 41°F | 26°F | 54°F 1987 | -9°F 1980 | 36% | 13% |
| Jan 29 | 41°F | 26°F | 55°F 2015 | -3°F 1969 | 36% | 13% |
| Jan 30 | 41°F | 26°F | 60°F 1967 | -9°F 1979 | 36% | 13% |
| Jan 31 | 41°F | 26°F | 61°F 1971 | -17°F 1996 | 36% | 13% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (PST).
- January 1
- sunrise 7:31 AM, sunset 4:20 PM
- January 31
- sunrise 7:13 AM, sunset 4:58 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00358746 (Union), public domain. Records: NOAA GHCN-Daily, station USC00354622, 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.