Riverton Weather in December
Average highs run from 34°F on December 1 to 28°F on December 31, and lows from 10°F to 3°F. Normal precipitation for the month is 0.31 in over about 4 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
- 30°F
- Average low
- 6°F
- Precipitation
- 0.31 in
- Snowfall
- 5.3 in
- Record high
- 64°FDec 24, 2025
- Record low
- -31°FDec 22, 2022
- Chance of a freeze
- 100%
- Daylight
- 9 h 15 min to 9 h 04 min
- Cloud cover
- 65%
- Humidity
- 66%
- Dew point
- 13°F
- Wind
- 11.4 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 | 34°F | 10°F | 61°F 2021 | -11°F 2019 | 13% | 14% |
| Dec 2 | 34°F | 10°F | 61°F 2021 | -7°F 2007 | 13% | 14% |
| Dec 3 | 33°F | 9°F | 57°F 1998 | -1°F 2009 | 13% | 14% |
| Dec 4 | 33°F | 9°F | 57°F 2007 | -8°F 2009 | 13% | 14% |
| Dec 5 | 32°F | 9°F | 56°F 2012 | -4°F 2011 | 13% | 14% |
| Dec 6 | 32°F | 8°F | 48°F 2008 | -13°F 2005 | 13% | 15% |
| Dec 7 | 32°F | 8°F | 56°F 2008 | -18°F 2005 | 13% | 15% |
| Dec 8 | 31°F | 7°F | 51°F 2021 | -18°F 2005 | 13% | 15% |
| Dec 9 | 31°F | 7°F | 58°F 2025 | -8°F 2007 | 13% | 15% |
| Dec 10 | 31°F | 7°F | 56°F 2025 | -8°F 2007 | 13% | 15% |
| Dec 11 | 30°F | 6°F | 59°F 2004 | -9°F 2000 | 13% | 15% |
| Dec 12 | 30°F | 6°F | 59°F 2025 | -10°F 2007 | 13% | 15% |
| Dec 13 | 30°F | 6°F | 55°F 2010 | -7°F 2000 | 13% | 15% |
| Dec 14 | 29°F | 6°F | 54°F 2010 | -13°F 2008 | 13% | 15% |
| Dec 15 | 29°F | 5°F | 57°F 2006 | -16°F 2008 | 13% | 15% |
| Dec 16 | 29°F | 5°F | 62°F 2025 | -11°F 2019 | 13% | 15% |
| Dec 17 | 29°F | 5°F | 58°F 2025 | -23°F 2016 | 13% | 15% |
| Dec 18 | 29°F | 5°F | 49°F 2024 | -18°F 2016 | 13% | 15% |
| Dec 19 | 28°F | 5°F | 55°F 2025 | -13°F 1998 | 13% | 15% |
| Dec 20 | 28°F | 4°F | 49°F 2020 | -21°F 1998 | 13% | 15% |
| Dec 21 | 28°F | 4°F | 55°F 2025 | -23°F 2022 | 14% | 15% |
| Dec 22 | 28°F | 4°F | 59°F 2025 | -31°F 2022 | 14% | 15% |
| Dec 23 | 28°F | 4°F | 57°F 2025 | -26°F 2022 | 14% | 15% |
| Dec 24 | 28°F | 4°F | 64°F 2025 | -15°F 2017 | 14% | 15% |
| Dec 25 | 28°F | 4°F | 55°F 2025 | -10°F 2002 | 14% | 15% |
| Dec 26 | 28°F | 4°F | 48°F 2025 | -11°F 2002 | 14% | 15% |
| Dec 27 | 28°F | 4°F | 45°F 1999 | -10°F 2017 | 14% | 15% |
| Dec 28 | 28°F | 4°F | 50°F 1998 | -11°F 2007 | 14% | 15% |
| Dec 29 | 28°F | 4°F | 55°F 1996 | -9°F 2012 | 14% | 15% |
| Dec 30 | 28°F | 3°F | 51°F 1996 | -11°F 2012 | 14% | 15% |
| Dec 31 | 28°F | 3°F | 51°F 1996 | -23°F 2014 | 14% | 15% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MST).
- December 1
- sunrise 7:25 AM, sunset 4:40 PM
- December 31
- sunrise 7:45 AM, sunset 4:49 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00487760 (Riverton), public domain. Records: NOAA GHCN-Daily, station USW00024061, 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.