Sun Valley Weather in December
Average highs run from 34°F on December 1 to 30°F on December 31, and lows from 12°F to 8°F. Normal precipitation for the month is 2.57 in over about 11 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
- 9°F
- Precipitation
- 2.57 in
- Snowfall
- 32.0 in
- Record high
- 58°FDec 2, 2021
- Record low
- -7°FDec 22, 2022
- Chance of a freeze
- 100%
- Daylight
- 9 h 11 min to 8 h 59 min
- Cloud cover
- 61%
- Humidity
- 83%
- Dew point
- 13°F
- Wind
- 6.3 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 | 12°F | 51°F 2021 | 2°F 2015 | 30% | 24% |
| Dec 2 | 33°F | 12°F | 58°F 2021 | 3°F 2022 | 30% | 24% |
| Dec 3 | 33°F | 12°F | 53°F 2021 | 4°F 2022 | 31% | 25% |
| Dec 4 | 33°F | 11°F | 56°F 2021 | 8°F 2018 | 31% | 25% |
| Dec 5 | 32°F | 11°F | 53°F 2023 | 7°F 2018 | 31% | 26% |
| Dec 6 | 32°F | 11°F | 52°F 2023 | 4°F 2018 | 31% | 27% |
| Dec 7 | 32°F | 11°F | 49°F 2014 | 2°F 2016 | 32% | 27% |
| Dec 8 | 31°F | 10°F | 48°F 2014 | 3°F 2016 | 32% | 28% |
| Dec 9 | 31°F | 10°F | 52°F 2025 | 12°F 2017 | 32% | 28% |
| Dec 10 | 31°F | 10°F | 54°F 2025 | 10°F 2024 | 32% | 28% |
| Dec 11 | 31°F | 10°F | 57°F 2025 | 13°F 2016 | 33% | 29% |
| Dec 12 | 30°F | 10°F | 58°F 2025 | 10°F 2016 | 33% | 29% |
| Dec 13 | 30°F | 9°F | 53°F 2025 | 8°F 2016 | 33% | 30% |
| Dec 14 | 30°F | 9°F | 55°F 2025 | 11°F 2022 | 33% | 30% |
| Dec 15 | 30°F | 9°F | 52°F 2025 | 5°F 2020 | 33% | 30% |
| Dec 16 | 30°F | 9°F | 54°F 2025 | -1°F 2022 | 34% | 30% |
| Dec 17 | 29°F | 9°F | 52°F 2025 | 2°F 2022 | 34% | 31% |
| Dec 18 | 29°F | 9°F | 44°F 2024 | -3°F 2016 | 34% | 31% |
| Dec 19 | 29°F | 8°F | 50°F 2023 | -3°F 2016 | 34% | 31% |
| Dec 20 | 29°F | 8°F | 51°F 2023 | 8°F 2022 | 34% | 31% |
| Dec 21 | 29°F | 8°F | 51°F 2020 | 3°F 2022 | 34% | 31% |
| Dec 22 | 29°F | 8°F | 46°F 2023 | -7°F 2022 | 34% | 31% |
| Dec 23 | 29°F | 8°F | 46°F 2025 | 1°F 2022 | 34% | 31% |
| Dec 24 | 29°F | 8°F | 46°F 2025 | 5°F 2017 | 34% | 32% |
| Dec 25 | 29°F | 8°F | 47°F 2025 | 0°F 2015 | 34% | 32% |
| Dec 26 | 29°F | 8°F | 42°F 2025 | 3°F 2015 | 34% | 32% |
| Dec 27 | 29°F | 8°F | 46°F 2017 | 0°F 2015 | 34% | 32% |
| Dec 28 | 29°F | 8°F | 44°F 2017 | 4°F 2021 | 34% | 32% |
| Dec 29 | 29°F | 8°F | 53°F 2017 | 3°F 2020 | 34% | 32% |
| Dec 30 | 29°F | 8°F | 48°F 2017 | -3°F 2014 | 34% | 32% |
| Dec 31 | 30°F | 8°F | 48°F 2025 | -5°F 2014 | 34% | 32% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MST).
- December 1
- sunrise 7:51 AM, sunset 5:02 PM
- December 31
- sunrise 8:11 AM, sunset 5:10 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00104845 (Ketchum RS), public domain. Records: NOAA GHCN-Daily, station USC00100774, 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.