Grantsville Weather in December
Average highs run from 42°F on December 1 to 37°F on December 31, and lows from 23°F to 19°F. Normal precipitation for the month is 0.83 in over about 8 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
- 20°F
- Precipitation
- 0.83 in
- Snowfall
- 7.9 in
- Record high
- 70°FDec 1, 1995
- Record low
- -16°FDec 23, 1990
- Chance of a freeze
- 100%
- Daylight
- 9 h 29 min to 9 h 20 min
- Cloud cover
- 60%
- Humidity
- 73%
- Dew point
- 19°F
- Wind
- 6.9 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 | 42°F | 23°F | 70°F 1995 | 3°F 1991 | 22% | 12% |
| Dec 2 | 41°F | 23°F | 62°F 2008 | 10°F 1930 | 22% | 13% |
| Dec 3 | 41°F | 22°F | 66°F 1998 | 10°F 1934 | 23% | 13% |
| Dec 4 | 41°F | 22°F | 61°F 1946 | 2°F 1992 | 23% | 13% |
| Dec 5 | 40°F | 22°F | 66°F 1932 | 1°F 1972 | 23% | 13% |
| Dec 6 | 40°F | 22°F | 58°F 1946 | 0°F 1972 | 23% | 14% |
| Dec 7 | 40°F | 21°F | 60°F 2023 | 5°F 1978 | 23% | 14% |
| Dec 8 | 39°F | 21°F | 64°F 1939 | 1°F 1971 | 23% | 14% |
| Dec 9 | 39°F | 21°F | 63°F 1929 | -7°F 1972 | 23% | 14% |
| Dec 10 | 39°F | 21°F | 65°F 1939 | -12°F 1972 | 23% | 15% |
| Dec 11 | 39°F | 20°F | 65°F 1929 | -9°F 1972 | 23% | 15% |
| Dec 12 | 38°F | 20°F | 63°F 2014 | -12°F 1932 | 24% | 15% |
| Dec 13 | 38°F | 20°F | 62°F 1921 | -11°F 1932 | 24% | 15% |
| Dec 14 | 38°F | 20°F | 62°F 1946 | -9°F 1932 | 24% | 16% |
| Dec 15 | 38°F | 20°F | 60°F 1981 | -6°F 1972 | 24% | 16% |
| Dec 16 | 38°F | 20°F | 58°F 1939 | 2°F 1919 | 24% | 16% |
| Dec 17 | 38°F | 20°F | 67°F 2025 | 3°F 1909 | 24% | 16% |
| Dec 18 | 37°F | 19°F | 56°F 1917 | -12°F 1924 | 24% | 16% |
| Dec 19 | 37°F | 19°F | 65°F 2025 | -12°F 1924 | 24% | 16% |
| Dec 20 | 37°F | 19°F | 63°F 1981 | -1°F 1908 | 25% | 16% |
| Dec 21 | 37°F | 19°F | 65°F 1969 | -5°F 1990 | 25% | 16% |
| Dec 22 | 37°F | 19°F | 67°F 2025 | -11°F 1990 | 25% | 16% |
| Dec 23 | 37°F | 19°F | 65°F 2025 | -16°F 1990 | 25% | 16% |
| Dec 24 | 37°F | 19°F | 65°F 2025 | -12°F 1990 | 25% | 16% |
| Dec 25 | 37°F | 19°F | 60°F 2025 | -14°F 1924 | 25% | 16% |
| Dec 26 | 37°F | 19°F | 62°F 1928 | -11°F 1924 | 25% | 16% |
| Dec 27 | 37°F | 19°F | 57°F 1928 | -6°F 1924 | 25% | 16% |
| Dec 28 | 37°F | 19°F | 60°F 2005 | -5°F 1916 | 25% | 16% |
| Dec 29 | 37°F | 19°F | 62°F 2024 | -1°F 1990 | 25% | 16% |
| Dec 30 | 37°F | 19°F | 60°F 2011 | -12°F 1990 | 25% | 16% |
| Dec 31 | 37°F | 19°F | 58°F 2011 | -5°F 1990 | 25% | 16% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MST).
- December 1
- sunrise 7:34 AM, sunset 5:03 PM
- December 31
- sunrise 7:53 AM, sunset 5:13 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00423348 (Grantsville 2W), public domain. Records: NOAA GHCN-Daily, station USC00428771, 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.