Rapid City Weather in December
Average highs run from 36°F on December 1 to 28°F on December 31, and lows from 23°F to 14°F. Normal precipitation for the month is 2.16 in over about 16 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
- 31°F
- Average low
- 18°F
- Precipitation
- 2.16 in
- Snowfall
- 29.7 in
- Record high
- 65°FDec 1, 1998
- Record low
- -31°FDec 28, 1976
- Chance of a freeze
- 100%
- Daylight
- 9 h 03 min to 8 h 51 min
- Cloud cover
- 80%
- Humidity
- 86%
- Dew point
- 26°F
- Wind
- 15.4 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 | 36°F | 23°F | 65°F 1998 | -5°F 1936 | 50% | 32% |
| Dec 2 | 35°F | 23°F | 61°F 1982 | -9°F 1976 | 51% | 32% |
| Dec 3 | 35°F | 22°F | 64°F 1982 | -1°F 1976 | 51% | 33% |
| Dec 4 | 35°F | 22°F | 64°F 2012 | -9°F 1930 | 51% | 33% |
| Dec 5 | 34°F | 22°F | 62°F 2001 | -10°F 1964 | 51% | 34% |
| Dec 6 | 34°F | 21°F | 64°F 2001 | -14°F 1964 | 51% | 34% |
| Dec 7 | 34°F | 21°F | 54°F 2015 | -4°F 1954 | 51% | 35% |
| Dec 8 | 33°F | 21°F | 59°F 1946 | -2°F 1977 | 50% | 35% |
| Dec 9 | 33°F | 21°F | 60°F 1946 | -3°F 1962 | 50% | 36% |
| Dec 10 | 33°F | 20°F | 52°F 2023 | -6°F 1932 | 50% | 36% |
| Dec 11 | 32°F | 20°F | 55°F 1971 | 2°F 1995 | 50% | 36% |
| Dec 12 | 32°F | 20°F | 56°F 1949 | -13°F 1989 | 50% | 37% |
| Dec 13 | 32°F | 19°F | 50°F 1991 | -20°F 1937 | 51% | 37% |
| Dec 14 | 31°F | 19°F | 59°F 1975 | -14°F 1937 | 51% | 37% |
| Dec 15 | 31°F | 19°F | 57°F 2015 | -7°F 2007 | 51% | 38% |
| Dec 16 | 31°F | 18°F | 63°F 2021 | -4°F 1961 | 51% | 38% |
| Dec 17 | 31°F | 18°F | 54°F 1984 | -14°F 1926 | 51% | 38% |
| Dec 18 | 30°F | 18°F | 47°F 1949 | -20°F 1926 | 51% | 38% |
| Dec 19 | 30°F | 18°F | 50°F 2002 | -13°F 2004 | 51% | 39% |
| Dec 20 | 30°F | 17°F | 48°F 1988 | -20°F 1983 | 51% | 39% |
| Dec 21 | 30°F | 17°F | 53°F 1967 | -12°F 1983 | 51% | 39% |
| Dec 22 | 29°F | 17°F | 55°F 1957 | -10°F 1945 | 51% | 39% |
| Dec 23 | 29°F | 16°F | 52°F 1957 | -22°F 1945 | 51% | 40% |
| Dec 24 | 29°F | 16°F | 52°F 1994 | -14°F 1969 | 51% | 40% |
| Dec 25 | 29°F | 16°F | 58°F 1982 | -15°F 1958 | 51% | 40% |
| Dec 26 | 29°F | 15°F | 56°F 2023 | -15°F 2013 | 51% | 40% |
| Dec 27 | 28°F | 15°F | 54°F 2016 | -18°F 2004 | 51% | 41% |
| Dec 28 | 28°F | 15°F | 57°F 1984 | -31°F 1976 | 52% | 41% |
| Dec 29 | 28°F | 15°F | 56°F 1984 | -21°F 1976 | 52% | 41% |
| Dec 30 | 28°F | 14°F | 58°F 1936 | -24°F 1976 | 52% | 41% |
| Dec 31 | 28°F | 14°F | 58°F 1965 | -14°F 1948 | 52% | 41% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (EST).
- December 1
- sunrise 7:59 AM, sunset 5:02 PM
- December 31
- sunrise 8:19 AM, sunset 5:10 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00204257 (Kalkaska), public domain. Records: NOAA GHCN-Daily, station USC00202381, 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.