Spearfish Weather in January
Average highs run from 36°F on January 1 to 36°F on January 31, and lows from 16°F to 15°F. Normal precipitation for the month is 0.60 in over about 7 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
- 36°F
- Average low
- 16°F
- Precipitation
- 0.60 in
- Snowfall
- 8.2 in
- Record high
- 79°FJan 19, 1921
- Record low
- -32°FJan 4, 1950
- Chance of a freeze
- 100%
- Daylight
- 8 h 55 min to 9 h 48 min
- Cloud cover
- 66%
- Humidity
- 73%
- Dew point
- 17°F
- Wind
- 9.6 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 | 36°F | 16°F | 63°F 1997 | -24°F 1924 | 20% | 16% |
| Jan 2 | 36°F | 16°F | 66°F 1927 | -24°F 1968 | 20% | 16% |
| Jan 3 | 36°F | 16°F | 60°F 1893 | -28°F 1950 | 20% | 16% |
| Jan 4 | 36°F | 16°F | 59°F 1956 | -32°F 1950 | 20% | 16% |
| Jan 5 | 36°F | 16°F | 68°F 1921 | -19°F 1909 | 20% | 16% |
| Jan 6 | 36°F | 16°F | 65°F 1914 | -24°F 1912 | 21% | 17% |
| Jan 7 | 36°F | 16°F | 66°F 2003 | -22°F 1912 | 21% | 17% |
| Jan 8 | 36°F | 16°F | 63°F 1958 | -19°F 1976 | 21% | 17% |
| Jan 9 | 36°F | 16°F | 67°F 2012 | -22°F 1930 | 21% | 17% |
| Jan 10 | 36°F | 16°F | 63°F 1928 | -24°F 1982 | 22% | 17% |
| Jan 11 | 36°F | 16°F | 68°F 1953 | -22°F 1912 | 22% | 17% |
| Jan 12 | 36°F | 16°F | 67°F 1987 | -31°F 1916 | 22% | 18% |
| Jan 13 | 36°F | 16°F | 62°F 1983 | -28°F 1916 | 22% | 18% |
| Jan 14 | 36°F | 16°F | 60°F 1933 | -26°F 2024 | 22% | 18% |
| Jan 15 | 36°F | 16°F | 72°F 1986 | -23°F 1907 | 23% | 18% |
| Jan 16 | 36°F | 16°F | 68°F 1973 | -28°F 2024 | 23% | 18% |
| Jan 17 | 36°F | 16°F | 66°F 1974 | -30°F 1943 | 23% | 18% |
| Jan 18 | 36°F | 16°F | 64°F 1965 | -30°F 1943 | 23% | 19% |
| Jan 19 | 36°F | 16°F | 79°F 1921 | -24°F 1943 | 23% | 19% |
| Jan 20 | 36°F | 16°F | 66°F 1986 | -30°F 1985 | 24% | 19% |
| Jan 21 | 36°F | 16°F | 63°F 2009 | -23°F 1966 | 24% | 19% |
| Jan 22 | 36°F | 16°F | 64°F 1942 | -22°F 1917 | 24% | 19% |
| Jan 23 | 36°F | 16°F | 65°F 1931 | -26°F 1949 | 24% | 19% |
| Jan 24 | 36°F | 16°F | 68°F 1981 | -24°F 1929 | 24% | 19% |
| Jan 25 | 36°F | 16°F | 67°F 1973 | -21°F 1950 | 24% | 19% |
| Jan 26 | 36°F | 16°F | 63°F 2015 | -21°F 1902 | 24% | 19% |
| Jan 27 | 36°F | 15°F | 70°F 2015 | -26°F 1918 | 24% | 19% |
| Jan 28 | 36°F | 15°F | 67°F 2015 | -26°F 1929 | 24% | 19% |
| Jan 29 | 36°F | 15°F | 70°F 1931 | -31°F 1916 | 24% | 19% |
| Jan 30 | 36°F | 15°F | 68°F 1925 | -30°F 1918 | 24% | 19% |
| Jan 31 | 36°F | 15°F | 66°F 1989 | -30°F 1893 | 25% | 19% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MST).
- January 1
- sunrise 7:32 AM, sunset 4:27 PM
- January 31
- sunrise 7:15 AM, sunset 5:03 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00397882 (Spearfish), public domain. Records: NOAA GHCN-Daily, station USC00397882, 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.