Prosser Weather in December
Average highs run from 43°F on December 1 to 38°F on December 31, and lows from 28°F to 26°F. Normal precipitation for the month is 1.33 in over about 8 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
- 26°F
- Precipitation
- 1.33 in
- Record high
- 69°FDec 13, 1924
- Record low
- -15°FDec 15, 1919
- Chance of a freeze
- 100%
- Daylight
- 8 h 54 min to 8 h 41 min
- Cloud cover
- 74%
- Humidity
- 83%
- Dew point
- 28°F
- Wind
- 9.4 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 | 43°F | 28°F | 65°F 1941 | 5°F 1985 | 26% |
| Dec 2 | 43°F | 28°F | 66°F 1972 | 8°F 1985 | 26% |
| Dec 3 | 42°F | 28°F | 64°F 1918 | 5°F 1919 | 26% |
| Dec 4 | 42°F | 27°F | 67°F 1923 | 4°F 1919 | 26% |
| Dec 5 | 42°F | 27°F | 64°F 2007 | 4°F 1919 | 26% |
| Dec 6 | 41°F | 27°F | 60°F 1936 | 3°F 1919 | 26% |
| Dec 7 | 41°F | 27°F | 60°F 1970 | 7°F 1956 | 26% |
| Dec 8 | 41°F | 27°F | 60°F 1973 | -4°F 1972 | 27% |
| Dec 9 | 40°F | 27°F | 61°F 1933 | -2°F 1972 | 27% |
| Dec 10 | 40°F | 27°F | 64°F 1946 | -5°F 1932 | 27% |
| Dec 11 | 40°F | 26°F | 64°F 1921 | -5°F 1932 | 27% |
| Dec 12 | 40°F | 26°F | 68°F 1924 | -4°F 1922 | 27% |
| Dec 13 | 40°F | 26°F | 69°F 1924 | -8°F 1922 | 27% |
| Dec 14 | 39°F | 26°F | 63°F 1917 | -7°F 1922 | 26% |
| Dec 15 | 39°F | 26°F | 64°F 1917 | -15°F 1919 | 26% |
| Dec 16 | 39°F | 26°F | 62°F 1917 | -12°F 1922 | 26% |
| Dec 17 | 39°F | 26°F | 66°F 1999 | -9°F 1964 | 26% |
| Dec 18 | 39°F | 26°F | 65°F 1917 | -7°F 1924 | 26% |
| Dec 19 | 39°F | 26°F | 61°F 1917 | -7°F 1924 | 26% |
| Dec 20 | 38°F | 26°F | 58°F 1933 | -2°F 1924 | 26% |
| Dec 21 | 38°F | 26°F | 66°F 1933 | -3°F 1990 | 26% |
| Dec 22 | 38°F | 26°F | 65°F 1933 | -7°F 1895 | 26% |
| Dec 23 | 38°F | 26°F | 62°F 1899 | -7°F 1983 | 26% |
| Dec 24 | 38°F | 26°F | 67°F 1950 | -9°F 1924 | 26% |
| Dec 25 | 38°F | 26°F | 63°F 1922 | -10°F 1924 | 26% |
| Dec 26 | 38°F | 26°F | 63°F 1980 | -5°F 1924 | 26% |
| Dec 27 | 38°F | 26°F | 64°F 1980 | 7°F 2008 | 26% |
| Dec 28 | 38°F | 26°F | 63°F 1967 | -1°F 1983 | 26% |
| Dec 29 | 38°F | 26°F | 65°F 1917 | 0°F 1968 | 26% |
| Dec 30 | 38°F | 26°F | 62°F 1920 | -6°F 1968 | 26% |
| Dec 31 | 38°F | 26°F | 56°F 1938 | -6°F 1968 | 26% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (PST).
- December 1
- sunrise 7:21 AM, sunset 4:15 PM
- December 31
- sunrise 7:42 AM, sunset 4:23 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00456768 (Prosser), public domain. Records: NOAA GHCN-Daily, station USC00458207, 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.