December weather in Sunnyside, WA
The average temperature in Sunnyside in December is 29.7°F (22.4°F–37.1°F). Average precipitation: 1.18 inches.
December is a winter month in Sunnyside, and is cooler than the annual average of 49.9°F. Daily temperatures swing about 14.7°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 8h 25m. For travel, December is cold.
Avg High
37.1°F
Avg Low
22.4°F
Precipitation
1.18 in
Daylight
8h 25m
December records in Sunnyside
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 64.9°F (1941) | 5.0°F (1985) | 0.73 in (1944) |
| December 2 | 66.0°F (1972) | 8.1°F (1985) | 0.41 in (1980) |
| December 3 | 64.0°F (1918) | 5.0°F (1919) | 0.29 in (1985) |
| December 4 | 66.9°F (1923) | 3.9°F (1919) | 0.31 in (1974) |
| December 5 | 64.0°F (2007) | 3.9°F (1919) | 0.30 in (1989) |
| December 6 | 60.1°F (1936) | 3.0°F (1919) | 0.54 in (1963) |
| December 7 | 60.1°F (1970) | 7.0°F (1956) | 0.26 in (2007) |
| December 8 | 60.1°F (1973) | -4.0°F (1972) | 0.40 in (1909) |
| December 9 | 61.0°F (1933) | -2.0°F (1972) | 0.39 in (1987) |
| December 10 | 64.0°F (1946) | -5.1°F (1932) | 0.41 in (1990) |
| December 11 | 64.0°F (1921) | -5.1°F (1932) | 0.40 in (1977) |
| December 12 | 68.0°F (1924) | -4.0°F (1922) | 5.24 in (1994) |
| December 13 | 69.1°F (1924) | -8.0°F (1922) | 0.60 in (1897) |
| December 14 | 63.0°F (1917) | -7.1°F (1922) | 0.72 in (1977) |
| December 15 | 64.0°F (1917) | -15.0°F (1919) | 0.70 in (1981) |
| December 16 | 62.1°F (1917) | -11.9°F (1922) | 0.25 in (1950) |
| December 17 | 66.0°F (1999) | -9.0°F (1964) | 0.35 in (1915) |
| December 18 | 64.9°F (1917) | -7.1°F (1924) | 0.42 in (1932) |
| December 19 | 61.0°F (1917) | -7.1°F (1924) | 0.55 in (1895) |
| December 20 | 57.9°F (1933) | -2.0°F (1924) | 0.37 in (1925) |
| December 21 | 66.0°F (1933) | -2.9°F (1990) | 0.71 in (1940) |
| December 22 | 64.9°F (1933) | -7.1°F (1895) | 0.80 in (1964) |
| December 23 | 62.1°F (1899) | -7.1°F (1983) | 0.28 in (1936) |
| December 24 | 66.9°F (1950) | -9.0°F (1924) | 0.35 in (1964) |
| December 25 | 63.0°F (1922) | -9.9°F (1924) | 0.88 in (1933) |
| December 26 | 63.0°F (1980) | -5.1°F (1924) | 0.26 in (1935) |
| December 27 | 64.0°F (1980) | 7.0°F (2008) | 0.58 in (1942) |
| December 28 | 63.0°F (1967) | -0.9°F (1983) | 0.43 in (1945) |
| December 29 | 64.9°F (1917) | 0.0°F (1968) | 0.61 in (2010) |
| December 30 | 62.1°F (1920) | -6.0°F (1968) | 0.42 in (2005) |
| December 31 | 55.9°F (1938) | -6.0°F (1968) | 0.31 in (1922) |