Richland Weather in December
Average highs run from 43°F on December 1 to 39°F on December 31, and lows from 30°F to 28°F. Normal precipitation for the month is 1.07 in over about 12 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
- 40°F
- Average low
- 28°F
- Precipitation
- 1.07 in
- Snowfall
- 1.4 in
- Record high
- 69°FDec 1, 2021
- Record low
- -10°FDec 30, 1968
- Chance of a freeze
- 100%
- Daylight
- 8 h 52 min to 8 h 41 min
- Cloud cover
- 74%
- Humidity
- 82%
- Dew point
- 27°F
- Wind
- 7.4 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 | 43°F | 30°F | 69°F 2021 | 4°F 1985 | 37% | 1% |
| Dec 2 | 43°F | 30°F | 65°F 1972 | 6°F 1985 | 37% | 1% |
| Dec 3 | 42°F | 30°F | 66°F 1958 | 15°F 1976 | 37% | 1% |
| Dec 4 | 42°F | 30°F | 65°F 1946 | 12°F 2013 | 38% | 1% |
| Dec 5 | 42°F | 30°F | 59°F 1966 | 8°F 2013 | 38% | 1% |
| Dec 6 | 41°F | 29°F | 60°F 1946 | 10°F 2013 | 38% | 1% |
| Dec 7 | 41°F | 29°F | 63°F 1970 | 7°F 2009 | 38% | 1% |
| Dec 8 | 41°F | 29°F | 66°F 2015 | -4°F 1972 | 38% | 2% |
| Dec 9 | 41°F | 29°F | 69°F 1946 | -2°F 1972 | 38% | 2% |
| Dec 10 | 40°F | 29°F | 67°F 2025 | -1°F 1972 | 38% | 2% |
| Dec 11 | 40°F | 29°F | 65°F 2014 | -5°F 1972 | 38% | 2% |
| Dec 12 | 40°F | 29°F | 64°F 1955 | -4°F 1972 | 38% | 2% |
| Dec 13 | 40°F | 28°F | 62°F 1946 | -3°F 1972 | 38% | 2% |
| Dec 14 | 40°F | 28°F | 61°F 2002 | 0°F 1972 | 38% | 2% |
| Dec 15 | 40°F | 28°F | 69°F 2025 | 7°F 1972 | 38% | 2% |
| Dec 16 | 39°F | 28°F | 65°F 1959 | -3°F 1964 | 38% | 2% |
| Dec 17 | 39°F | 28°F | 63°F 2025 | -6°F 1964 | 38% | 2% |
| Dec 18 | 39°F | 28°F | 59°F 2024 | 0°F 1964 | 38% | 2% |
| Dec 19 | 39°F | 28°F | 58°F 1966 | 4°F 1984 | 38% | 3% |
| Dec 20 | 39°F | 28°F | 64°F 1994 | 4°F 2008 | 38% | 3% |
| Dec 21 | 39°F | 28°F | 64°F 1994 | -6°F 1990 | 39% | 3% |
| Dec 22 | 39°F | 28°F | 63°F 1972 | -5°F 1990 | 39% | 3% |
| Dec 23 | 39°F | 28°F | 60°F 1950 | -4°F 1983 | 39% | 3% |
| Dec 24 | 39°F | 28°F | 64°F 1950 | -3°F 1983 | 39% | 3% |
| Dec 25 | 39°F | 28°F | 56°F 1950 | 0°F 1983 | 39% | 3% |
| Dec 26 | 39°F | 28°F | 63°F 1980 | 0°F 1983 | 39% | 3% |
| Dec 27 | 39°F | 28°F | 65°F 1980 | 2°F 1948 | 39% | 3% |
| Dec 28 | 39°F | 28°F | 63°F 1967 | -8°F 1990 | 39% | 3% |
| Dec 29 | 39°F | 28°F | 59°F 1980 | -5°F 1990 | 39% | 3% |
| Dec 30 | 39°F | 28°F | 62°F 1949 | -10°F 1968 | 39% | 3% |
| Dec 31 | 39°F | 28°F | 57°F 1945 | -2°F 1968 | 39% | 3% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (PST).
- December 1
- sunrise 7:20 AM, sunset 4:12 PM
- December 31
- sunrise 7:40 AM, sunset 4:21 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00457015 (Richland), public domain. Records: NOAA GHCN-Daily, station USC00457015, 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.