Boulder Weather in January
Average highs run from 46°F on January 1 to 47°F on January 31, and lows from 21°F to 21°F. Normal precipitation for the month is 0.83 in over about 6 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
- 47°F
- Average low
- 22°F
- Precipitation
- 0.83 in
- Snowfall
- 11.3 in
- Record high
- 73°FJan 20, 2005
- Record low
- -33°FJan 17, 1930
- Chance of a freeze
- 100%
- Daylight
- 9 h 24 min to 10 h 09 min
- Cloud cover
- 63%
- Humidity
- 77%
- Dew point
- 12°F
- Wind
- 11.0 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 | 46°F | 21°F | 70°F 1997 | -14°F 1924 | 18% | 17% |
| Jan 2 | 46°F | 21°F | 70°F 1997 | -14°F 1911 | 18% | 17% |
| Jan 3 | 47°F | 21°F | 68°F 1997 | -10°F 1911 | 18% | 17% |
| Jan 4 | 47°F | 21°F | 70°F 2026 | -14°F 1959 | 18% | 17% |
| Jan 5 | 47°F | 21°F | 71°F 1984 | -13°F 1942 | 18% | 17% |
| Jan 6 | 47°F | 21°F | 70°F 1954 | -20°F 1913 | 18% | 17% |
| Jan 7 | 47°F | 21°F | 69°F 2006 | -22°F 1913 | 18% | 17% |
| Jan 8 | 47°F | 21°F | 70°F 1909 | -16°F 1937 | 18% | 17% |
| Jan 9 | 47°F | 22°F | 72°F 1953 | -11°F 1962 | 18% | 18% |
| Jan 10 | 47°F | 22°F | 66°F 1928 | -13°F 1962 | 18% | 18% |
| Jan 11 | 47°F | 22°F | 69°F 1953 | -18°F 1963 | 18% | 18% |
| Jan 12 | 47°F | 22°F | 70°F 1953 | -22°F 1963 | 18% | 18% |
| Jan 13 | 47°F | 22°F | 69°F 1996 | -12°F 1997 | 18% | 18% |
| Jan 14 | 47°F | 22°F | 67°F 2006 | -9°F 1972 | 18% | 18% |
| Jan 15 | 47°F | 22°F | 69°F 1901 | -11°F 2024 | 18% | 18% |
| Jan 16 | 47°F | 22°F | 71°F 1974 | -14°F 2024 | 19% | 18% |
| Jan 17 | 47°F | 22°F | 67°F 1974 | -33°F 1930 | 19% | 18% |
| Jan 18 | 47°F | 22°F | 65°F 1965 | -19°F 1984 | 19% | 18% |
| Jan 19 | 47°F | 22°F | 69°F 1986 | -17°F 1963 | 19% | 19% |
| Jan 20 | 47°F | 22°F | 73°F 2005 | -15°F 1935 | 19% | 19% |
| Jan 21 | 47°F | 22°F | 70°F 2009 | -18°F 1930 | 19% | 19% |
| Jan 22 | 47°F | 22°F | 67°F 1943 | -11°F 1917 | 20% | 19% |
| Jan 23 | 47°F | 22°F | 71°F 1981 | -10°F 1963 | 20% | 19% |
| Jan 24 | 47°F | 22°F | 70°F 1968 | -8°F 1949 | 20% | 20% |
| Jan 25 | 47°F | 22°F | 70°F 1935 | -8°F 1902 | 20% | 20% |
| Jan 26 | 47°F | 22°F | 72°F 1982 | -20°F 1902 | 21% | 20% |
| Jan 27 | 47°F | 22°F | 72°F 2015 | -7°F 1895 | 21% | 20% |
| Jan 28 | 47°F | 22°F | 68°F 2011 | -9°F 1902 | 21% | 20% |
| Jan 29 | 47°F | 22°F | 70°F 1931 | -12°F 1951 | 21% | 21% |
| Jan 30 | 47°F | 21°F | 71°F 1986 | -7°F 2023 | 21% | 21% |
| Jan 31 | 47°F | 21°F | 70°F 1906 | -9°F 1985 | 22% | 21% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MST).
- January 1
- sunrise 7:23 AM, sunset 4:47 PM
- January 31
- sunrise 7:10 AM, sunset 5:19 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00050848 (Boulder), public domain. Records: NOAA GHCN-Daily, station USC00050848, 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.