Richland Weather in December
Average highs run from 66°F on December 1 to 61°F on December 31, and lows from 36°F to 34°F. Normal precipitation for the month is 4.14 in over about 6 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
- 63°F
- Average low
- 35°F
- Precipitation
- 4.14 in
- Record high
- 82°FDec 5, 1977
- Record low
- 4°FDec 13, 1962
- Chance of a freeze
- 100%
- Daylight
- 10 h 12 min to 10 h 05 min
- Cloud cover
- 58%
- Humidity
- 81%
- Dew point
- 42°F
- Wind
- 7.4 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Dec 1 | 66°F | 36°F | 79°F 1991 | 21°F 1964 | 19% |
| Dec 2 | 66°F | 36°F | 79°F 1982 | 24°F 1960 | 19% |
| Dec 3 | 66°F | 36°F | 79°F 1982 | 19°F 1960 | 19% |
| Dec 4 | 65°F | 36°F | 80°F 2005 | 21°F 1960 | 19% |
| Dec 5 | 65°F | 36°F | 82°F 1977 | 26°F 1957 | 19% |
| Dec 6 | 65°F | 36°F | 78°F 1951 | 24°F 1962 | 19% |
| Dec 7 | 65°F | 36°F | 79°F 1978 | 22°F 1977 | 19% |
| Dec 8 | 64°F | 36°F | 80°F 2022 | 22°F 2006 | 19% |
| Dec 9 | 64°F | 35°F | 77°F 1952 | 22°F 2006 | 20% |
| Dec 10 | 64°F | 35°F | 79°F 1972 | 19°F 1995 | 20% |
| Dec 11 | 64°F | 35°F | 79°F 2021 | 21°F 1957 | 20% |
| Dec 12 | 63°F | 35°F | 80°F 1971 | 9°F 1962 | 20% |
| Dec 13 | 63°F | 35°F | 77°F 1984 | 4°F 1962 | 20% |
| Dec 14 | 63°F | 35°F | 78°F 1984 | 17°F 1960 | 20% |
| Dec 15 | 63°F | 35°F | 77°F 1971 | 18°F 1968 | 20% |
| Dec 16 | 63°F | 35°F | 82°F 1971 | 17°F 1951 | 20% |
| Dec 17 | 63°F | 35°F | 79°F 1984 | 18°F 1960 | 20% |
| Dec 18 | 62°F | 35°F | 78°F 1984 | 18°F 1953 | 20% |
| Dec 19 | 62°F | 35°F | 77°F 2006 | 15°F 1953 | 21% |
| Dec 20 | 62°F | 35°F | 74°F 1978 | 17°F 1981 | 21% |
| Dec 21 | 62°F | 35°F | 75°F 1971 | 18°F 1981 | 21% |
| Dec 22 | 62°F | 35°F | 76°F 1990 | 16°F 1960 | 21% |
| Dec 23 | 62°F | 35°F | 77°F 1970 | 14°F 1989 | 21% |
| Dec 24 | 61°F | 35°F | 80°F 2025 | 9°F 1989 | 21% |
| Dec 25 | 61°F | 35°F | 78°F 2015 | 8°F 1983 | 21% |
| Dec 26 | 61°F | 35°F | 80°F 1987 | 10°F 1983 | 21% |
| Dec 27 | 61°F | 35°F | 79°F 2015 | 23°F 1985 | 21% |
| Dec 28 | 61°F | 35°F | 80°F 1984 | 23°F 1977 | 22% |
| Dec 29 | 61°F | 34°F | 79°F 1984 | 22°F 1952 | 22% |
| Dec 30 | 61°F | 34°F | 80°F 1984 | 15°F 1961 | 22% |
| Dec 31 | 61°F | 34°F | 80°F 2021 | 18°F 1983 | 22% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (EST).
- December 1
- sunrise 7:22 AM, sunset 5:34 PM
- December 31
- sunrise 7:39 AM, sunset 5:44 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00095394 (Lumpkin 2 Se), public domain. Records: NOAA GHCN-Daily, station USW00093842, 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.