Rapid Valley Weather in December
Average highs run from 41°F on December 1 to 36°F on December 31, and lows from 22°F to 17°F. Normal precipitation for the month is 0.37 in over about 6 wet days.
December day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
December at a glance
- Average high
- 38°F
- Average low
- 19°F
- Precipitation
- 0.37 in
- Snowfall
- 6.6 in
- Record high
- 75°FDec 2, 2021
- Record low
- -30°FDec 30, 1990
- Chance of a freeze
- 100%
- Daylight
- 9 h 08 min to 8 h 57 min
- Cloud cover
- 65%
- Humidity
- 68%
- Dew point
- 18°F
- Wind
- 10.1 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 |
|---|---|---|---|---|---|---|
| Dec 1 | 41°F | 22°F | 74°F 2021 | -14°F 1985 | 15% | 17% |
| Dec 2 | 40°F | 21°F | 75°F 2021 | -19°F 1985 | 15% | 17% |
| Dec 3 | 40°F | 21°F | 68°F 1948 | -6°F 2006 | 16% | 17% |
| Dec 4 | 40°F | 21°F | 75°F 1965 | -5°F 1972 | 16% | 17% |
| Dec 5 | 40°F | 20°F | 67°F 1987 | -22°F 1972 | 16% | 17% |
| Dec 6 | 39°F | 20°F | 65°F 1981 | -20°F 1972 | 16% | 17% |
| Dec 7 | 39°F | 20°F | 69°F 1984 | -14°F 2013 | 16% | 18% |
| Dec 8 | 39°F | 20°F | 68°F 2020 | -23°F 1972 | 16% | 18% |
| Dec 9 | 38°F | 20°F | 70°F 1957 | -19°F 1972 | 16% | 18% |
| Dec 10 | 38°F | 19°F | 68°F 1987 | -14°F 1972 | 16% | 18% |
| Dec 11 | 38°F | 19°F | 71°F 2014 | -19°F 2000 | 17% | 18% |
| Dec 12 | 38°F | 19°F | 71°F 2014 | -19°F 2000 | 17% | 18% |
| Dec 13 | 38°F | 19°F | 65°F 1988 | -15°F 1985 | 17% | 18% |
| Dec 14 | 37°F | 19°F | 70°F 1998 | -25°F 1989 | 17% | 18% |
| Dec 15 | 37°F | 18°F | 64°F 2025 | -22°F 1989 | 17% | 18% |
| Dec 16 | 37°F | 18°F | 67°F 2025 | -20°F 1964 | 17% | 18% |
| Dec 17 | 37°F | 18°F | 69°F 1998 | -23°F 1964 | 17% | 19% |
| Dec 18 | 37°F | 18°F | 70°F 1979 | -20°F 1983 | 17% | 19% |
| Dec 19 | 37°F | 18°F | 62°F 2025 | -17°F 1990 | 18% | 19% |
| Dec 20 | 37°F | 18°F | 63°F 1954 | -20°F 1983 | 18% | 19% |
| Dec 21 | 37°F | 18°F | 65°F 1991 | -25°F 1983 | 18% | 19% |
| Dec 22 | 37°F | 18°F | 67°F 2020 | -29°F 1989 | 18% | 19% |
| Dec 23 | 36°F | 18°F | 66°F 1955 | -27°F 1983 | 18% | 19% |
| Dec 24 | 36°F | 17°F | 63°F 2025 | -26°F 1983 | 18% | 19% |
| Dec 25 | 36°F | 17°F | 71°F 2025 | -21°F 1983 | 18% | 20% |
| Dec 26 | 36°F | 17°F | 64°F 2025 | -23°F 1996 | 18% | 20% |
| Dec 27 | 36°F | 17°F | 60°F 2025 | -12°F 2017 | 18% | 20% |
| Dec 28 | 36°F | 17°F | 62°F 1999 | -17°F 1990 | 18% | 20% |
| Dec 29 | 36°F | 17°F | 65°F 1965 | -29°F 1990 | 18% | 20% |
| Dec 30 | 36°F | 17°F | 60°F 1965 | -30°F 1990 | 18% | 20% |
| Dec 31 | 36°F | 17°F | 62°F 1963 | -21°F 2017 | 18% | 20% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MST).
- December 1
- sunrise 7:08 AM, sunset 4:16 PM
- December 31
- sunrise 7:27 AM, sunset 4:24 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00396948 (Rapid City WFO), public domain. Records: NOAA GHCN-Daily, station USW00024090, 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.