Riverton Weather in December
Average highs run from 51°F on December 1 to 44°F on December 31, and lows from 31°F to 24°F. Normal precipitation for the month is 2.43 in over about 7 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
- 47°F
- Average low
- 28°F
- Precipitation
- 2.43 in
- Snowfall
- 2.3 in
- Record high
- 79°FDec 25, 2025
- Record low
- -15°FDec 22, 1989
- Chance of a freeze
- 100%
- Daylight
- 9 h 48 min to 9 h 40 min
- Cloud cover
- 60%
- Humidity
- 83%
- Dew point
- 30°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 | 51°F | 31°F | 75°F 1982 | 11°F 1985 | 24% | 2% |
| Dec 2 | 51°F | 31°F | 76°F 2021 | 6°F 2006 | 24% | 2% |
| Dec 3 | 51°F | 31°F | 74°F 2021 | 10°F 2006 | 24% | 3% |
| Dec 4 | 50°F | 31°F | 74°F 2001 | 11°F 2006 | 24% | 3% |
| Dec 5 | 50°F | 30°F | 76°F 1998 | 9°F 1950 | 24% | 3% |
| Dec 6 | 50°F | 30°F | 71°F 1998 | -1°F 1950 | 24% | 3% |
| Dec 7 | 49°F | 30°F | 76°F 1966 | 1°F 1950 | 23% | 3% |
| Dec 8 | 49°F | 29°F | 73°F 1991 | 7°F 1995 | 23% | 3% |
| Dec 9 | 49°F | 29°F | 71°F 1993 | 0°F 1995 | 23% | 3% |
| Dec 10 | 48°F | 29°F | 75°F 2020 | 0°F 1995 | 23% | 3% |
| Dec 11 | 48°F | 29°F | 74°F 1949 | 5°F 1962 | 23% | 3% |
| Dec 12 | 48°F | 28°F | 72°F 2015 | 1°F 1962 | 23% | 3% |
| Dec 13 | 47°F | 28°F | 76°F 1948 | 4°F 1961 | 23% | 3% |
| Dec 14 | 47°F | 28°F | 71°F 2008 | 2°F 1963 | 23% | 3% |
| Dec 15 | 47°F | 28°F | 76°F 2021 | -8°F 1989 | 23% | 3% |
| Dec 16 | 47°F | 27°F | 72°F 2006 | -7°F 1989 | 23% | 4% |
| Dec 17 | 46°F | 27°F | 68°F 1962 | 1°F 1989 | 23% | 4% |
| Dec 18 | 46°F | 27°F | 69°F 2002 | -4°F 2016 | 23% | 4% |
| Dec 19 | 46°F | 27°F | 72°F 1978 | 0°F 1983 | 23% | 4% |
| Dec 20 | 46°F | 26°F | 70°F 1979 | 0°F 1983 | 23% | 4% |
| Dec 21 | 45°F | 26°F | 69°F 2017 | -7°F 1989 | 23% | 4% |
| Dec 22 | 45°F | 26°F | 71°F 1982 | -15°F 1989 | 23% | 4% |
| Dec 23 | 45°F | 26°F | 74°F 2025 | -15°F 1989 | 23% | 4% |
| Dec 24 | 45°F | 26°F | 77°F 2025 | -10°F 1983 | 23% | 4% |
| Dec 25 | 45°F | 25°F | 79°F 2025 | -11°F 1983 | 23% | 4% |
| Dec 26 | 44°F | 25°F | 75°F 2021 | 0°F 1983 | 23% | 5% |
| Dec 27 | 44°F | 25°F | 79°F 2025 | 9°F 2022 | 23% | 5% |
| Dec 28 | 44°F | 25°F | 70°F 2025 | 0°F 1983 | 23% | 5% |
| Dec 29 | 44°F | 25°F | 71°F 2022 | -9°F 1983 | 23% | 5% |
| Dec 30 | 44°F | 24°F | 70°F 1951 | -9°F 1983 | 23% | 5% |
| Dec 31 | 44°F | 24°F | 74°F 1951 | -5°F 1976 | 23% | 5% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CST).
- December 1
- sunrise 7:14 AM, sunset 5:02 PM
- December 31
- sunrise 7:32 AM, sunset 5:12 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00141740 (Columbus), public domain. Records: NOAA GHCN-Daily, station USW00013987, 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.