December weather in Union, OR
The average temperature in Union in December is 32.0°F (25.1°F–39.0°F). Average precipitation: 1.22 inches. Average snowfall is 4.9 inches.
December is a winter month in Union, and is cooler than the annual average of 49°F. Daily temperatures swing about 13.9°F between overnight low and afternoon high. Expect about 12 days with precipitation. Daylight averages about 8h 34m. For travel, December is cold.
Avg High
39.0°F
Avg Low
25.1°F
Precipitation
1.22 in
Snow
4.9 in
December records in Union
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 57.9°F (2008) | 8.1°F (1985) | 0.76 in (1993) |
| December 2 | 55.9°F (1927) | 10.0°F (1985) | 0.30 in (1941) |
| December 3 | 57.0°F (1939) | 5.0°F (1919) | 0.80 in (1966) |
| December 4 | 62.1°F (1946) | -4.0°F (1919) | 0.37 in (1950) |
| December 5 | 62.1°F (2007) | -2.0°F (1992) | 0.90 in (1978) |
| December 6 | 61.0°F (1939) | 0.0°F (1919) | 0.41 in (1971) |
| December 7 | 55.0°F (1939) | 1.0°F (1978) | 1.10 in (1957) |
| December 8 | 57.0°F (1939) | -6.0°F (1972) | 0.39 in (1936) |
| December 9 | 55.0°F (1981) | -15.0°F (1972) | 0.90 in (1918) |
| December 10 | 57.9°F (1939) | -11.9°F (1932) | 0.49 in (2025) |
| December 11 | 59.0°F (1993) | -9.0°F (1961) | 0.86 in (1958) |
| December 12 | 57.0°F (1921) | -11.9°F (1919) | 0.87 in (1946) |
| December 13 | 61.0°F (1929) | -24.0°F (1919) | 0.81 in (1966) |
| December 14 | 62.1°F (1929) | -11.9°F (1926) | 0.66 in (1915) |
| December 15 | 57.9°F (2002) | -4.0°F (1967) | 0.38 in (2006) |
| December 16 | 57.9°F (1939) | -4.0°F (1924) | 0.61 in (1941) |
| December 17 | 55.0°F (1917) | -24.0°F (1964) | 0.50 in (1931) |
| December 18 | 57.9°F (1917) | -20.9°F (1964) | 0.34 in (1916) |
| December 19 | 57.9°F (1917) | -14.1°F (1924) | 0.62 in (1953) |
| December 20 | 54.0°F (1941) | -4.0°F (1990) | 0.53 in (1969) |
| December 21 | 55.9°F (1933) | -15.0°F (1990) | 0.40 in (1955) |
| December 22 | 61.0°F (1955) | -22.0°F (1990) | 0.45 in (1951) |
| December 23 | 57.9°F (1945) | -18.9°F (1990) | 0.40 in (1967) |
| December 24 | 57.0°F (1945) | -16.1°F (1983) | 0.42 in (1964) |
| December 25 | 55.9°F (1945) | -2.0°F (1983) | 0.54 in (1980) |
| December 26 | 55.0°F (1980) | 3.0°F (1987) | 0.80 in (1933) |
| December 27 | 53.1°F (1917) | 0.0°F (1971) | 0.52 in (1994) |
| December 28 | 53.1°F (1917) | 5.0°F (1971) | 1.20 in (1917) |
| December 29 | 60.1°F (1917) | -11.0°F (1990) | 0.55 in (1924) |
| December 30 | 57.9°F (2005) | -11.9°F (1915) | 0.82 in (1983) |
| December 31 | 53.1°F (1917) | -9.9°F (1978) | 0.61 in (1996) |