Sun Valley Weather in December
Average highs run from 47°F on December 1 to 45°F on December 31, and lows from 28°F to 27°F. Normal precipitation for the month is 1.20 in over about 7 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
- 45°F
- Average low
- 27°F
- Precipitation
- 1.20 in
- Snowfall
- 7.4 in
- Record high
- 69°FDec 1, 2008
- Record low
- -22°FDec 22, 1990
- Chance of a freeze
- 100%
- Daylight
- 9 h 34 min to 9 h 25 min
- Cloud cover
- 58%
- Humidity
- 76%
- Dew point
- 22°F
- Wind
- 6.5 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 | 47°F | 28°F | 69°F 2008 | 10°F 1991 | 19% | 9% |
| Dec 2 | 47°F | 28°F | 69°F 2008 | 7°F 2004 | 19% | 9% |
| Dec 3 | 47°F | 28°F | 63°F 2013 | 8°F 2004 | 20% | 9% |
| Dec 4 | 46°F | 28°F | 63°F 2007 | 7°F 2004 | 20% | 9% |
| Dec 5 | 46°F | 28°F | 63°F 2007 | 3°F 1992 | 20% | 10% |
| Dec 6 | 46°F | 27°F | 62°F 2021 | 3°F 2013 | 20% | 10% |
| Dec 7 | 46°F | 27°F | 57°F 2008 | 10°F 1998 | 20% | 10% |
| Dec 8 | 45°F | 27°F | 61°F 1989 | -11°F 2009 | 21% | 11% |
| Dec 9 | 45°F | 27°F | 62°F 1990 | -7°F 2013 | 21% | 11% |
| Dec 10 | 45°F | 27°F | 63°F 1993 | -2°F 2013 | 21% | 11% |
| Dec 11 | 45°F | 27°F | 64°F 2004 | 0°F 2013 | 21% | 11% |
| Dec 12 | 45°F | 27°F | 59°F 2004 | 2°F 2013 | 21% | 11% |
| Dec 13 | 45°F | 27°F | 63°F 2010 | 10°F 2013 | 21% | 12% |
| Dec 14 | 44°F | 27°F | 59°F 2016 | 8°F 1990 | 21% | 12% |
| Dec 15 | 44°F | 26°F | 58°F 2018 | 8°F 1990 | 22% | 12% |
| Dec 16 | 44°F | 26°F | 58°F 1999 | 7°F 2008 | 22% | 12% |
| Dec 17 | 44°F | 26°F | 55°F 2018 | 0°F 2008 | 22% | 12% |
| Dec 18 | 44°F | 26°F | 58°F 1998 | -3°F 2008 | 22% | 12% |
| Dec 19 | 44°F | 26°F | 57°F 2000 | 3°F 2006 | 22% | 13% |
| Dec 20 | 44°F | 26°F | 58°F 2005 | 1°F 1990 | 22% | 13% |
| Dec 21 | 44°F | 26°F | 61°F 2018 | -11°F 1990 | 22% | 13% |
| Dec 22 | 44°F | 26°F | 58°F 2019 | -22°F 1990 | 22% | 13% |
| Dec 23 | 44°F | 26°F | 59°F 2005 | -8°F 1998 | 22% | 13% |
| Dec 24 | 44°F | 26°F | 57°F 2005 | -18°F 1990 | 22% | 13% |
| Dec 25 | 44°F | 26°F | 58°F 2006 | 6°F 1987 | 22% | 13% |
| Dec 26 | 44°F | 26°F | 56°F 2004 | -1°F 1990 | 22% | 13% |
| Dec 27 | 44°F | 26°F | 62°F 2022 | -2°F 1990 | 22% | 13% |
| Dec 28 | 44°F | 27°F | 61°F 2011 | 10°F 2012 | 23% | 13% |
| Dec 29 | 44°F | 27°F | 58°F 2011 | 4°F 1990 | 23% | 14% |
| Dec 30 | 44°F | 27°F | 67°F 2017 | -3°F 1990 | 23% | 14% |
| Dec 31 | 45°F | 27°F | 65°F 2017 | -3°F 1990 | 23% | 14% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (PST).
- December 1
- sunrise 7:01 AM, sunset 4:35 PM
- December 31
- sunrise 7:20 AM, sunset 4:45 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00266791 (Reno WFO), public domain. Records: NOAA GHCN-Daily, station USC00267820, 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.