King County Weather in December
Average highs run from 61°F on December 1 to 56°F on December 31, and lows from 32°F to 27°F. Normal precipitation for the month is 0.97 in over about 3 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
- 57°F
- Average low
- 29°F
- Precipitation
- 0.97 in
- Snowfall
- 1.0 in
- Record high
- 88°FDec 4, 1954
- Record low
- -5°FDec 23, 1989
- Chance of a freeze
- 100%
- Daylight
- 10 h 06 min to 9 h 58 min
- Cloud cover
- 49%
- Humidity
- 59%
- Dew point
- 27°F
- Wind
- 10.5 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 | 61°F | 32°F | 86°F 2012 | 10°F 2006 | 10% | 1% |
| Dec 2 | 61°F | 32°F | 82°F 1995 | 11°F 1985 | 10% | 1% |
| Dec 3 | 60°F | 31°F | 85°F 2021 | 11°F 1985 | 10% | 2% |
| Dec 4 | 60°F | 31°F | 88°F 1954 | 17°F 1972 | 11% | 2% |
| Dec 5 | 60°F | 31°F | 82°F 2021 | 13°F 1950 | 11% | 2% |
| Dec 6 | 59°F | 31°F | 76°F 1987 | 7°F 1950 | 11% | 2% |
| Dec 7 | 59°F | 30°F | 83°F 2003 | 6°F 2013 | 11% | 2% |
| Dec 8 | 59°F | 30°F | 76°F 1970 | 5°F 2005 | 11% | 2% |
| Dec 9 | 59°F | 30°F | 81°F 1996 | 10°F 1978 | 11% | 2% |
| Dec 10 | 58°F | 30°F | 83°F 1996 | 11°F 1977 | 11% | 2% |
| Dec 11 | 58°F | 29°F | 77°F 1948 | 14°F 1961 | 11% | 2% |
| Dec 12 | 58°F | 29°F | 77°F 1973 | 9°F 1989 | 11% | 2% |
| Dec 13 | 58°F | 29°F | 82°F 1948 | 6°F 1985 | 11% | 2% |
| Dec 14 | 57°F | 29°F | 80°F 2021 | 7°F 1985 | 11% | 2% |
| Dec 15 | 57°F | 29°F | 83°F 2010 | 8°F 1987 | 10% | 2% |
| Dec 16 | 57°F | 29°F | 85°F 2016 | 7°F 1987 | 10% | 2% |
| Dec 17 | 57°F | 28°F | 82°F 1980 | 7°F 1987 | 11% | 2% |
| Dec 18 | 57°F | 28°F | 77°F 1973 | 7°F 1983 | 11% | 2% |
| Dec 19 | 56°F | 28°F | 75°F 1994 | 8°F 1983 | 11% | 2% |
| Dec 20 | 56°F | 28°F | 80°F 2025 | 6°F 1983 | 11% | 2% |
| Dec 21 | 56°F | 28°F | 79°F 1981 | 3°F 1983 | 11% | 2% |
| Dec 22 | 56°F | 28°F | 84°F 2025 | -3°F 1989 | 11% | 2% |
| Dec 23 | 56°F | 28°F | 87°F 1955 | -5°F 1989 | 11% | 2% |
| Dec 24 | 56°F | 28°F | 87°F 1955 | 2°F 1983 | 11% | 2% |
| Dec 25 | 56°F | 28°F | 87°F 2025 | 3°F 1983 | 11% | 2% |
| Dec 26 | 56°F | 27°F | 85°F 2021 | 5°F 1983 | 11% | 2% |
| Dec 27 | 56°F | 27°F | 87°F 2025 | 11°F 1983 | 11% | 2% |
| Dec 28 | 56°F | 27°F | 76°F 1964 | 11°F 1966 | 11% | 2% |
| Dec 29 | 56°F | 27°F | 80°F 1951 | 2°F 1983 | 11% | 2% |
| Dec 30 | 56°F | 27°F | 82°F 1951 | 2°F 1983 | 11% | 2% |
| Dec 31 | 56°F | 27°F | 83°F 2011 | 6°F 1968 | 11% | 2% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CST).
- December 1
- sunrise 7:27 AM, sunset 5:33 PM
- December 31
- sunrise 7:45 AM, sunset 5:43 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00413828 (Guthrie), public domain. Records: NOAA GHCN-Daily, station USW00023007, 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.