Shelley Weather in December
Average highs run from 35°F on December 1 to 28°F on December 31, and lows from 17°F to 11°F. Normal precipitation for the month is 0.78 in over about 10 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
- 13°F
- Precipitation
- 0.78 in
- Snowfall
- 16.0 in
- Record high
- 58°FDec 11, 2014
- Record low
- -31°FDec 5, 1972
- Chance of a freeze
- 100%
- Daylight
- 9 h 13 min to 9 h 01 min
- Cloud cover
- 69%
- Humidity
- 87%
- Dew point
- 16°F
- Wind
- 8.7 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 | 35°F | 17°F | 54°F 2012 | -2°F 1967 | 28% | 22% |
| Dec 2 | 35°F | 17°F | 54°F 2021 | -1°F 2015 | 28% | 22% |
| Dec 3 | 34°F | 17°F | 56°F 1987 | -15°F 1992 | 28% | 23% |
| Dec 4 | 34°F | 16°F | 54°F 2021 | -19°F 1992 | 28% | 23% |
| Dec 5 | 33°F | 16°F | 51°F 2021 | -31°F 1972 | 29% | 23% |
| Dec 6 | 33°F | 16°F | 55°F 1987 | -16°F 1972 | 29% | 24% |
| Dec 7 | 33°F | 15°F | 48°F 1981 | -14°F 1972 | 29% | 24% |
| Dec 8 | 32°F | 15°F | 48°F 2006 | -20°F 1972 | 29% | 24% |
| Dec 9 | 32°F | 15°F | 57°F 2015 | -29°F 1972 | 29% | 25% |
| Dec 10 | 31°F | 14°F | 53°F 2025 | -30°F 1972 | 30% | 25% |
| Dec 11 | 31°F | 14°F | 58°F 2014 | -26°F 1972 | 30% | 25% |
| Dec 12 | 31°F | 14°F | 58°F 2014 | -14°F 1967 | 30% | 26% |
| Dec 13 | 30°F | 14°F | 50°F 2025 | -14°F 1967 | 30% | 26% |
| Dec 14 | 30°F | 13°F | 51°F 2002 | -13°F 1951 | 30% | 26% |
| Dec 15 | 30°F | 13°F | 50°F 2025 | -14°F 1972 | 30% | 26% |
| Dec 16 | 30°F | 13°F | 54°F 2025 | -14°F 1964 | 30% | 27% |
| Dec 17 | 29°F | 13°F | 53°F 2025 | -21°F 1964 | 30% | 27% |
| Dec 18 | 29°F | 13°F | 46°F 1962 | -14°F 2016 | 30% | 27% |
| Dec 19 | 29°F | 12°F | 48°F 2023 | -13°F 2016 | 30% | 27% |
| Dec 20 | 29°F | 12°F | 44°F 1958 | -19°F 1998 | 30% | 27% |
| Dec 21 | 29°F | 12°F | 50°F 1969 | -24°F 1983 | 30% | 28% |
| Dec 22 | 29°F | 12°F | 51°F 1955 | -25°F 1983 | 30% | 28% |
| Dec 23 | 28°F | 12°F | 51°F 1955 | -30°F 1983 | 30% | 28% |
| Dec 24 | 28°F | 12°F | 52°F 2025 | -18°F 1990 | 30% | 28% |
| Dec 25 | 28°F | 12°F | 52°F 2025 | -15°F 1990 | 30% | 28% |
| Dec 26 | 28°F | 12°F | 53°F 1980 | -15°F 2001 | 30% | 28% |
| Dec 27 | 28°F | 11°F | 53°F 1980 | -17°F 1954 | 30% | 29% |
| Dec 28 | 28°F | 11°F | 46°F 2002 | -13°F 1954 | 30% | 29% |
| Dec 29 | 28°F | 11°F | 49°F 2011 | -18°F 1978 | 29% | 29% |
| Dec 30 | 28°F | 11°F | 52°F 2011 | -24°F 1978 | 29% | 29% |
| Dec 31 | 28°F | 11°F | 48°F 1980 | -29°F 1978 | 29% | 29% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MST).
- December 1
- sunrise 7:41 AM, sunset 4:54 PM
- December 31
- sunrise 8:01 AM, sunset 5:02 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00024145 (Idaho Falls Fanning Fld), public domain. Records: NOAA GHCN-Daily, station USW00024145, 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.