December weather in Grand Coulee, WA
The average temperature in Grand Coulee in December is 28.5°F (23.9°F–33.1°F). Average precipitation: 1.42 inches.
December is a winter month in Grand Coulee, and is cooler than the annual average of 49.9°F. Daily temperatures swing about 9.2°F between overnight low and afternoon high. Expect about 12 days with precipitation. Daylight averages about 8h 12m. For travel, December is cold.
Avg High
33.1°F
Avg Low
23.9°F
Precipitation
1.42 in
Daylight
8h 12m
December records in Grand Coulee
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 66.0°F (2021) | -8.0°F (1985) | 0.55 in (2001) |
| December 2 | 57.9°F (1941) | -8.0°F (1985) | 0.95 in (1996) |
| December 3 | 54.0°F (1968) | 8.1°F (1942) | 0.48 in (2001) |
| December 4 | 57.9°F (2007) | 7.0°F (2022) | 0.54 in (1974) |
| December 5 | 55.0°F (1945) | 8.1°F (1950) | 0.45 in (2023) |
| December 6 | 55.9°F (1945) | 1.9°F (1956) | 0.74 in (1985) |
| December 7 | 54.0°F (1936) | 1.9°F (1972) | 0.50 in (2015) |
| December 8 | 55.9°F (1939) | -2.0°F (1972) | 0.45 in (1971) |
| December 9 | 52.0°F (2015) | 3.9°F (1972) | 0.38 in (1948) |
| December 10 | 57.9°F (1939) | 3.9°F (1961) | 0.59 in (1937) |
| December 11 | 55.0°F (2014) | 5.0°F (1961) | 0.43 in (1968) |
| December 12 | 55.0°F (2014) | 5.0°F (1972) | 0.68 in (1983) |
| December 13 | 51.1°F (1936) | 1.9°F (1972) | 0.49 in (1977) |
| December 14 | 53.1°F (2002) | 3.0°F (1955) | 0.40 in (1977) |
| December 15 | 57.0°F (1939) | -2.0°F (1964) | 0.37 in (2009) |
| December 16 | 55.9°F (1941) | -13.0°F (1964) | 0.60 in (2002) |
| December 17 | 51.1°F (1939) | -11.9°F (1964) | 0.37 in (2020) |
| December 18 | 57.9°F (1936) | -5.1°F (1964) | 0.66 in (1960) |
| December 19 | 53.1°F (1936) | 1.0°F (2022) | 0.67 in (1964) |
| December 20 | 52.0°F (1994) | -4.0°F (1983) | 0.60 in (1992) |
| December 21 | 50.0°F (1934) | -8.0°F (1983) | 0.47 in (1969) |
| December 22 | 55.9°F (1936) | -9.9°F (1983) | 0.53 in (2005) |
| December 23 | 48.0°F (2020) | -11.0°F (1983) | 0.38 in (1969) |
| December 24 | 48.9°F (1940) | -7.1°F (1983) | 0.58 in (1943) |
| December 25 | 50.0°F (1957) | -2.0°F (1948) | 0.35 in (1998) |
| December 26 | 57.9°F (1980) | -0.9°F (1996) | 0.61 in (1975) |
| December 27 | 57.9°F (1980) | -0.9°F (1948) | 0.89 in (2022) |
| December 28 | 54.0°F (1937) | -8.0°F (1968) | 0.53 in (1992) |
| December 29 | 50.0°F (1937) | -15.0°F (1968) | 0.35 in (1983) |
| December 30 | 46.0°F (1937) | -16.1°F (1968) | 0.65 in (2020) |
| December 31 | 46.0°F (1954) | -11.0°F (1978) | 0.70 in (2020) |