December weather in Prosser, WA
The average temperature in Prosser in December is 32.9°F (26.3°F–39.5°F). Average precipitation: 1.33 inches.
December is a winter month in Prosser, and is cooler than the annual average of 53°F. Daily temperatures swing about 13.2°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 8h 26m. For travel, December is cold.
Avg High
39.5°F
Avg Low
26.3°F
Precipitation
1.33 in
Daylight
8h 26m
December records in Prosser
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 63.0°F (2021) | 0.0°F (1985) | 0.72 in (1944) |
| December 2 | 70.0°F (2021) | 6.1°F (1985) | 0.60 in (1999) |
| December 3 | 64.0°F (1958) | 10.0°F (1985) | 0.39 in (2007) |
| December 4 | 61.0°F (1982) | 10.9°F (1928) | 0.58 in (2012) |
| December 5 | 62.1°F (2007) | 7.0°F (1972) | 0.29 in (1971) |
| December 6 | 66.0°F (1987) | -13.0°F (2007) | 0.63 in (1963) |
| December 7 | 60.1°F (2023) | 7.0°F (1956) | 0.44 in (2007) |
| December 8 | 60.1°F (2023) | -5.1°F (1972) | 0.65 in (1996) |
| December 9 | 64.0°F (2015) | -2.9°F (1972) | 0.30 in (1955) |
| December 10 | 61.0°F (2025) | -5.1°F (1972) | 0.50 in (1990) |
| December 11 | 64.9°F (2025) | -6.0°F (1932) | 0.68 in (1977) |
| December 12 | 64.0°F (2014) | -0.9°F (1932) | 0.39 in (2010) |
| December 13 | 64.0°F (2025) | -4.0°F (1972) | 0.43 in (1966) |
| December 14 | 64.0°F (2025) | -7.1°F (1972) | 0.70 in (1977) |
| December 15 | 62.1°F (1939) | -5.1°F (1972) | 0.47 in (2006) |
| December 16 | 66.9°F (2025) | -2.0°F (1964) | 0.37 in (1955) |
| December 17 | 66.9°F (2025) | -7.1°F (1964) | 0.34 in (1973) |
| December 18 | 57.9°F (1997) | -2.0°F (1964) | 1.50 in (2007) |
| December 19 | 55.9°F (2017) | 0.0°F (2016) | 0.60 in (2025) |
| December 20 | 61.0°F (1933) | -2.0°F (1998) | 0.32 in (1931) |
| December 21 | 64.9°F (1933) | -4.0°F (1990) | 0.77 in (1964) |
| December 22 | 64.0°F (1933) | -5.1°F (1983) | 0.61 in (1964) |
| December 23 | 59.0°F (1950) | -9.9°F (1983) | 0.68 in (1926) |
| December 24 | 63.0°F (1950) | 3.0°F (1990) | 0.45 in (1936) |
| December 25 | 54.0°F (1961) | 1.9°F (1983) | 1.00 in (2012) |
| December 26 | 62.1°F (1980) | 6.1°F (1970) | 0.94 in (2024) |
| December 27 | 63.0°F (1980) | 3.9°F (1948) | 0.54 in (1942) |
| December 28 | 63.0°F (1937) | 1.0°F (1996) | 0.48 in (1973) |
| December 29 | 57.9°F (1938) | -9.0°F (1990) | 1.08 in (2010) |
| December 30 | 59.0°F (1938) | -11.0°F (1968) | 0.51 in (2005) |
| December 31 | 57.0°F (1938) | -9.9°F (1968) | 0.53 in (1931) |