Boulder Weather in January
Average highs run from 34°F on January 1 to 36°F on January 31, and lows from 11°F to 13°F. Normal precipitation for the month is 0.28 in over about 5 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
- 35°F
- Average low
- 12°F
- Precipitation
- 0.28 in
- Record high
- 58°FJan 29, 1931
- Record low
- -48°FJan 7, 1937
- Chance of a freeze
- 100%
- Daylight
- 8 h 42 min to 9 h 40 min
- Cloud cover
- 69%
- Humidity
- 89%
- Dew point
- 15°F
- Wind
- 7.8 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Jan 1 | 34°F | 11°F | 56°F 1918 | -43°F 1942 | 20% |
| Jan 2 | 34°F | 11°F | 55°F 1918 | -34°F 1968 | 19% |
| Jan 3 | 34°F | 11°F | 53°F 1918 | -31°F 1950 | 19% |
| Jan 4 | 34°F | 11°F | 51°F 1984 | -40°F 1942 | 19% |
| Jan 5 | 34°F | 11°F | 49°F 1903 | -42°F 1979 | 19% |
| Jan 6 | 34°F | 11°F | 52°F 1914 | -36°F 1974 | 19% |
| Jan 7 | 34°F | 11°F | 51°F 1902 | -48°F 1937 | 19% |
| Jan 8 | 34°F | 11°F | 48°F 2002 | -45°F 1937 | 19% |
| Jan 9 | 35°F | 11°F | 52°F 1928 | -44°F 1962 | 19% |
| Jan 10 | 35°F | 11°F | 52°F 1928 | -43°F 1962 | 18% |
| Jan 11 | 35°F | 12°F | 50°F 1953 | -38°F 1963 | 18% |
| Jan 12 | 35°F | 12°F | 51°F 2026 | -39°F 1963 | 18% |
| Jan 13 | 35°F | 12°F | 52°F 1996 | -45°F 2024 | 18% |
| Jan 14 | 35°F | 12°F | 52°F 1920 | -30°F 1947 | 18% |
| Jan 15 | 35°F | 12°F | 50°F 1973 | -34°F 1947 | 18% |
| Jan 16 | 35°F | 12°F | 49°F 1974 | -32°F 1957 | 18% |
| Jan 17 | 35°F | 12°F | 51°F 1920 | -34°F 1930 | 18% |
| Jan 18 | 35°F | 12°F | 50°F 1919 | -43°F 1963 | 18% |
| Jan 19 | 35°F | 12°F | 56°F 2005 | -44°F 1963 | 18% |
| Jan 20 | 35°F | 12°F | 52°F 2005 | -47°F 1937 | 18% |
| Jan 21 | 36°F | 12°F | 50°F 2005 | -47°F 1937 | 18% |
| Jan 22 | 36°F | 13°F | 53°F 1994 | -35°F 1962 | 18% |
| Jan 23 | 36°F | 13°F | 57°F 2005 | -36°F 1969 | 18% |
| Jan 24 | 36°F | 13°F | 56°F 2005 | -38°F 1949 | 17% |
| Jan 25 | 36°F | 13°F | 54°F 2015 | -38°F 1949 | 17% |
| Jan 26 | 36°F | 13°F | 54°F 2015 | -41°F 1957 | 17% |
| Jan 27 | 36°F | 13°F | 51°F 1971 | -34°F 1951 | 17% |
| Jan 28 | 36°F | 13°F | 53°F 1920 | -43°F 1951 | 17% |
| Jan 29 | 36°F | 13°F | 58°F 1931 | -46°F 1951 | 17% |
| Jan 30 | 36°F | 13°F | 56°F 1971 | -39°F 1951 | 17% |
| Jan 31 | 36°F | 13°F | 55°F 1992 | -39°F 1951 | 17% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (MST).
- January 1
- sunrise 8:11 AM, sunset 4:53 PM
- January 31
- sunrise 7:52 AM, sunset 5:32 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00241008 (Boulder), public domain. Records: NOAA GHCN-Daily, station USW00024135, 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.