Cascade Weather in December
Average highs run from 41°F on December 1 to 38°F on December 31, and lows from 23°F to 18°F. Normal precipitation for the month is 0.69 in over about 5 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
- 0.69 in
- Snowfall
- 10.5 in
- Record high
- 66°FDec 1, 2021
- Record low
- -40°FDec 16, 2016
- Chance of a freeze
- 100%
- Daylight
- 8 h 46 min to 8 h 32 min
- Cloud cover
- 68%
- Humidity
- 77%
- Dew point
- 18°F
- Wind
- 11.9 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 | 41°F | 23°F | 66°F 2021 | -27°F 1985 | 18% | 14% |
| Dec 2 | 41°F | 23°F | 57°F 2008 | -28°F 1985 | 18% | 14% |
| Dec 3 | 40°F | 23°F | 55°F 1975 | -15°F 1972 | 18% | 14% |
| Dec 4 | 40°F | 22°F | 60°F 1989 | -28°F 1972 | 18% | 14% |
| Dec 5 | 40°F | 22°F | 57°F 1987 | -26°F 2013 | 18% | 14% |
| Dec 6 | 39°F | 22°F | 55°F 1987 | -32°F 1977 | 18% | 14% |
| Dec 7 | 39°F | 22°F | 57°F 1987 | -32°F 2013 | 18% | 14% |
| Dec 8 | 39°F | 21°F | 57°F 2020 | -35°F 1972 | 18% | 15% |
| Dec 9 | 39°F | 21°F | 58°F 1975 | -29°F 2009 | 18% | 15% |
| Dec 10 | 39°F | 21°F | 60°F 1990 | -20°F 1972 | 18% | 15% |
| Dec 11 | 38°F | 21°F | 56°F 1990 | -25°F 1989 | 18% | 15% |
| Dec 12 | 38°F | 20°F | 58°F 2014 | -23°F 2000 | 18% | 15% |
| Dec 13 | 38°F | 20°F | 54°F 2010 | -25°F 2016 | 18% | 15% |
| Dec 14 | 38°F | 20°F | 53°F 1998 | -25°F 2008 | 18% | 15% |
| Dec 15 | 38°F | 20°F | 53°F 1998 | -29°F 1964 | 18% | 15% |
| Dec 16 | 38°F | 20°F | 59°F 1980 | -40°F 2016 | 18% | 16% |
| Dec 17 | 38°F | 19°F | 59°F 1980 | -37°F 1964 | 18% | 16% |
| Dec 18 | 38°F | 19°F | 54°F 1979 | -23°F 1983 | 18% | 16% |
| Dec 19 | 38°F | 19°F | 57°F 2004 | -25°F 1990 | 18% | 16% |
| Dec 20 | 38°F | 19°F | 52°F 1979 | -35°F 1990 | 18% | 16% |
| Dec 21 | 37°F | 19°F | 55°F 2019 | -35°F 1990 | 18% | 16% |
| Dec 22 | 37°F | 19°F | 52°F 2005 | -23°F 1983 | 18% | 16% |
| Dec 23 | 38°F | 19°F | 52°F 2020 | -22°F 1989 | 18% | 16% |
| Dec 24 | 38°F | 19°F | 50°F 2005 | -38°F 1983 | 18% | 16% |
| Dec 25 | 38°F | 18°F | 58°F 2005 | -27°F 1983 | 18% | 16% |
| Dec 26 | 38°F | 18°F | 54°F 1980 | -37°F 2021 | 18% | 16% |
| Dec 27 | 38°F | 18°F | 56°F 1980 | -37°F 2021 | 18% | 16% |
| Dec 28 | 38°F | 18°F | 52°F 1989 | -25°F 1990 | 18% | 16% |
| Dec 29 | 38°F | 18°F | 50°F 1980 | -39°F 1968 | 18% | 16% |
| Dec 30 | 38°F | 18°F | 52°F 1997 | -31°F 2017 | 18% | 16% |
| Dec 31 | 38°F | 18°F | 49°F 2005 | -31°F 2017 | 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 7:53 AM, sunset 4:39 PM
- December 31
- sunrise 8:14 AM, sunset 4:46 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00241552 (Cascade 5 S), public domain. Records: NOAA GHCN-Daily, station USC00247159, 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.