Reliance Weather in December
Average highs run from 36°F on December 1 to 33°F on December 31, and lows from 15°F to 12°F. Normal precipitation for the month is 0.52 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
- 33°F
- Average low
- 12°F
- Precipitation
- 0.52 in
- Snowfall
- 6.5 in
- Record high
- 59°FDec 22, 2025
- Record low
- -29°FDec 21, 1990
- Chance of a freeze
- 100%
- Daylight
- 9 h 23 min to 9 h 12 min
- Cloud cover
- 60%
- Humidity
- 77%
- Dew point
- 14°F
- Wind
- 13.0 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 | 15°F | 57°F 1995 | -7°F 1991 | 15% | 12% |
| Dec 2 | 36°F | 15°F | 58°F 2021 | 0°F 1971 | 16% | 12% |
| Dec 3 | 35°F | 15°F | 53°F 1956 | -4°F 1967 | 16% | 13% |
| Dec 4 | 35°F | 14°F | 54°F 2021 | -13°F 1972 | 16% | 13% |
| Dec 5 | 35°F | 14°F | 51°F 1986 | -22°F 1972 | 16% | 13% |
| Dec 6 | 34°F | 14°F | 54°F 1981 | -19°F 2013 | 16% | 13% |
| Dec 7 | 34°F | 14°F | 51°F 1981 | -18°F 2005 | 16% | 14% |
| Dec 8 | 34°F | 13°F | 51°F 1976 | -20°F 2005 | 17% | 14% |
| Dec 9 | 34°F | 13°F | 53°F 1975 | -21°F 1972 | 17% | 14% |
| Dec 10 | 33°F | 13°F | 53°F 1981 | -28°F 1972 | 17% | 14% |
| Dec 11 | 33°F | 13°F | 53°F 2025 | -24°F 1972 | 17% | 14% |
| Dec 12 | 33°F | 12°F | 51°F 2004 | -12°F 1972 | 17% | 14% |
| Dec 13 | 33°F | 12°F | 51°F 2025 | -10°F 1967 | 17% | 15% |
| Dec 14 | 33°F | 12°F | 52°F 1977 | -10°F 2008 | 17% | 15% |
| Dec 15 | 33°F | 12°F | 51°F 2006 | -16°F 1972 | 18% | 15% |
| Dec 16 | 32°F | 12°F | 51°F 1980 | -12°F 1964 | 18% | 15% |
| Dec 17 | 32°F | 12°F | 57°F 1980 | -16°F 1964 | 18% | 15% |
| Dec 18 | 32°F | 12°F | 51°F 1980 | -12°F 1964 | 18% | 16% |
| Dec 19 | 32°F | 12°F | 54°F 2025 | -17°F 1990 | 18% | 16% |
| Dec 20 | 32°F | 12°F | 51°F 1981 | -25°F 1990 | 18% | 16% |
| Dec 21 | 32°F | 12°F | 58°F 2025 | -29°F 1990 | 18% | 16% |
| Dec 22 | 32°F | 11°F | 59°F 2025 | -29°F 1990 | 19% | 16% |
| Dec 23 | 32°F | 11°F | 56°F 2025 | -16°F 1990 | 19% | 16% |
| Dec 24 | 32°F | 11°F | 51°F 2025 | -16°F 1983 | 19% | 16% |
| Dec 25 | 32°F | 11°F | 55°F 2025 | -17°F 1987 | 19% | 16% |
| Dec 26 | 33°F | 11°F | 52°F 1980 | -17°F 1952 | 19% | 16% |
| Dec 27 | 33°F | 11°F | 51°F 1980 | -15°F 1948 | 19% | 16% |
| Dec 28 | 33°F | 11°F | 49°F 2005 | -15°F 2015 | 18% | 16% |
| Dec 29 | 33°F | 11°F | 47°F 2017 | -11°F 1978 | 18% | 16% |
| Dec 30 | 33°F | 12°F | 52°F 1980 | -22°F 1978 | 18% | 16% |
| Dec 31 | 33°F | 12°F | 53°F 1980 | -29°F 1978 | 18% | 16% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MST).
- December 1
- sunrise 7:24 AM, sunset 4:47 PM
- December 31
- sunrise 7:44 AM, sunset 4:56 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00487847 (Rock Springs Fire Dept), public domain. Records: NOAA GHCN-Daily, station USW00024027, 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.