December weather in Sumpter, OR
The average temperature in Sumpter in December is °F (°F–°F). Average precipitation: 4.20 inches.
December is a winter month in Sumpter, and is cooler than the annual average of 0°F. Expect about 15 days with precipitation. Daylight averages about 8h 38m.
Avg High
°F
Avg Low
°F
Precipitation
4.20 in
Daylight
8h 38m
December records in Sumpter
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 61.2°F (2021) | 10.6°F (2015) | 1.60 in (1980) |
| December 2 | 51.4°F (2021) | 9.9°F (1992) | 1.10 in (2007) |
| December 3 | 52.3°F (2021) | 5.0°F (1992) | 0.70 in (2007) |
| December 4 | 52.2°F (2021) | -0.9°F (2013) | 0.80 in (1996) |
| December 5 | 50.7°F (2000) | -4.0°F (2013) | 0.80 in (2025) |
| December 6 | 50.9°F (2024) | 2.5°F (2009) | 1.00 in (2001) |
| December 7 | 51.4°F (2017) | -10.5°F (2013) | 1.10 in (2015) |
| December 8 | 50.0°F (2017) | -13.2°F (2013) | 0.80 in (2004) |
| December 9 | 49.8°F (2011) | -13.2°F (2009) | 0.70 in (1996) |
| December 10 | 45.1°F (2004) | 3.6°F (2009) | 0.80 in (2023) |
| December 11 | 50.7°F (2017) | 5.7°F (2009) | 0.60 in (2021) |
| December 12 | 54.1°F (2025) | 7.0°F (1989) | 1.10 in (1995) |
| December 13 | 55.2°F (2025) | 9.1°F (1992) | 0.70 in (2002) |
| December 14 | 47.1°F (2025) | 6.1°F (1994) | 0.90 in (2016) |
| December 15 | 48.0°F (2025) | 5.0°F (2008) | 1.20 in (2009) |
| December 16 | 49.5°F (2025) | -6.2°F (2008) | 0.70 in (1987) |
| December 17 | 45.9°F (1988) | -5.8°F (2016) | 0.90 in (2015) |
| December 18 | 47.7°F (2004) | -2.6°F (2016) | 1.40 in (2025) |
| December 19 | 43.9°F (2004) | -12.3°F (1998) | 0.80 in (2010) |
| December 20 | 47.7°F (2023) | -24.7°F (1990) | 1.10 in (2013) |
| December 21 | 47.8°F (2020) | -26.5°F (1990) | 1.20 in (2014) |
| December 22 | 45.0°F (1999) | -25.2°F (1990) | 0.50 in (2000) |
| December 23 | 43.7°F (2013) | -15.3°F (1990) | 0.70 in (2016) |
| December 24 | 46.2°F (2004) | -13.7°F (1990) | 0.60 in (1981) |
| December 25 | 53.4°F (1999) | 1.9°F (1990) | 0.80 in (2012) |
| December 26 | 52.2°F (1999) | 2.7°F (1988) | 0.60 in (2006) |
| December 27 | 52.0°F (1999) | 4.1°F (1988) | 1.00 in (2024) |
| December 28 | 48.9°F (1999) | -12.6°F (1990) | 0.80 in (2005) |
| December 29 | 49.5°F (1997) | -19.1°F (1990) | 0.70 in (2024) |
| December 30 | 49.3°F (1997) | -11.0°F (1990) | 1.80 in (2005) |
| December 31 | 45.5°F (2023) | -3.3°F (2021) | 1.10 in (1996) |