Rock County Weather in January
Average highs run from 32°F on January 1 to 33°F on January 31, and lows from 11°F to 11°F. Normal precipitation for the month is 0.58 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
- 32°F
- Average low
- 11°F
- Precipitation
- 0.58 in
- Snowfall
- 7.0 in
- Record high
- 72°FJan 27, 2015
- Record low
- -31°FJan 5, 1924
- Chance of a freeze
- 100%
- Daylight
- 9 h 09 min to 9 h 59 min
- Cloud cover
- 64%
- Humidity
- 75%
- Dew point
- 17°F
- Wind
- 12.5 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 | 32°F | 11°F | 65°F 1939 | -25°F 1924 | 17% | 15% |
| Jan 2 | 32°F | 11°F | 64°F 1998 | -20°F 1911 | 17% | 15% |
| Jan 3 | 32°F | 11°F | 64°F 1962 | -28°F 1919 | 17% | 15% |
| Jan 4 | 32°F | 11°F | 66°F 2026 | -24°F 1950 | 17% | 15% |
| Jan 5 | 32°F | 11°F | 70°F 2012 | -31°F 1924 | 17% | 15% |
| Jan 6 | 32°F | 11°F | 64°F 1935 | -22°F 1912 | 17% | 15% |
| Jan 7 | 32°F | 11°F | 68°F 1914 | -24°F 1937 | 17% | 15% |
| Jan 8 | 32°F | 11°F | 67°F 1958 | -24°F 1937 | 17% | 15% |
| Jan 9 | 32°F | 11°F | 60°F 2018 | -20°F 1937 | 17% | 16% |
| Jan 10 | 32°F | 10°F | 68°F 1990 | -24°F 1982 | 17% | 16% |
| Jan 11 | 32°F | 10°F | 62°F 2006 | -22°F 1912 | 17% | 16% |
| Jan 12 | 32°F | 10°F | 69°F 1987 | -30°F 1916 | 17% | 16% |
| Jan 13 | 32°F | 10°F | 65°F 1928 | -30°F 1916 | 17% | 16% |
| Jan 14 | 32°F | 10°F | 69°F 2006 | -21°F 2024 | 17% | 16% |
| Jan 15 | 32°F | 10°F | 66°F 2012 | -19°F 1937 | 17% | 16% |
| Jan 16 | 32°F | 10°F | 66°F 1974 | -24°F 1918 | 17% | 16% |
| Jan 17 | 32°F | 10°F | 65°F 1923 | -30°F 1930 | 17% | 16% |
| Jan 18 | 32°F | 10°F | 62°F 1914 | -22°F 1940 | 17% | 16% |
| Jan 19 | 32°F | 10°F | 65°F 1906 | -25°F 1963 | 17% | 16% |
| Jan 20 | 32°F | 10°F | 65°F 1944 | -23°F 1943 | 18% | 16% |
| Jan 21 | 32°F | 10°F | 64°F 1989 | -23°F 1930 | 18% | 16% |
| Jan 22 | 32°F | 10°F | 68°F 1967 | -23°F 1915 | 18% | 16% |
| Jan 23 | 32°F | 10°F | 69°F 1981 | -24°F 1922 | 18% | 17% |
| Jan 24 | 32°F | 10°F | 69°F 1981 | -19°F 1929 | 18% | 17% |
| Jan 25 | 32°F | 10°F | 63°F 1913 | -19°F 1915 | 18% | 17% |
| Jan 26 | 32°F | 11°F | 70°F 2002 | -24°F 1950 | 18% | 17% |
| Jan 27 | 32°F | 11°F | 72°F 2015 | -23°F 1936 | 18% | 17% |
| Jan 28 | 32°F | 11°F | 61°F 2015 | -18°F 1972 | 18% | 17% |
| Jan 29 | 32°F | 11°F | 65°F 1920 | -28°F 1966 | 19% | 17% |
| Jan 30 | 32°F | 11°F | 65°F 2012 | -19°F 1966 | 19% | 17% |
| Jan 31 | 33°F | 11°F | 68°F 1989 | -20°F 1917 | 19% | 17% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CST).
- January 1
- sunrise 8:07 AM, sunset 5:16 PM
- January 31
- sunrise 7:52 AM, sunset 5:51 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00255925 (Newport), public domain. Records: NOAA GHCN-Daily, station USC00250050, 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 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.