December weather in Umatilla, OR
The average temperature in Umatilla in December is 36.0°F (30.7°F–41.2°F). Average precipitation: 1.22 inches.
December is a winter month in Umatilla, and is cooler than the annual average of 53.9°F. Daily temperatures swing about 10.5°F between overnight low and afternoon high. Expect about 14 days with precipitation. Daylight averages about 8h 28m. For travel, December is cold.
Avg High
41.2°F
Avg Low
30.7°F
Precipitation
1.22 in
Daylight
8h 28m
December records in Umatilla
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 60.1°F (2021) | 16.0°F (2014) | 0.20 in (2010) |
| December 2 | 71.1°F (2021) | 17.1°F (2014) | 0.29 in (2012) |
| December 3 | 60.1°F (2008) | 23.0°F (2009) | 0.24 in (2015) |
| December 4 | 68.0°F (2007) | 18.0°F (2013) | 0.20 in (2012) |
| December 5 | 64.0°F (2007) | 10.9°F (2013) | 0.28 in (2022) |
| December 6 | 57.0°F (2025) | 9.0°F (2013) | 0.15 in (2014) |
| December 7 | 57.0°F (2025) | 8.1°F (2013) | 0.52 in (2007) |
| December 8 | 55.0°F (2015) | 1.9°F (2013) | 0.29 in (2015) |
| December 9 | 69.1°F (2015) | 1.0°F (2013) | 0.58 in (2022) |
| December 10 | 57.0°F (2015) | 5.0°F (2013) | 0.45 in (2025) |
| December 11 | 66.9°F (2025) | 3.9°F (2009) | 0.10 in (2023) |
| December 12 | 68.0°F (2014) | 5.0°F (2009) | 0.14 in (2018) |
| December 13 | 60.1°F (2025) | 16.0°F (2013) | 0.15 in (2019) |
| December 14 | 57.9°F (2025) | 19.9°F (2016) | 0.14 in (2010) |
| December 15 | 54.0°F (2018) | 16.0°F (2008) | 0.06 in (2010) |
| December 16 | 66.0°F (2025) | 1.9°F (2008) | 0.33 in (2009) |
| December 17 | 57.0°F (2025) | 0.0°F (2008) | 0.16 in (2018) |
| December 18 | 52.0°F (2020) | 1.9°F (2016) | 0.13 in (2024) |
| December 19 | 59.0°F (2025) | 10.9°F (2016) | 0.35 in (2025) |
| December 20 | 55.9°F (2020) | 14.0°F (2016) | 0.67 in (2021) |
| December 21 | 63.0°F (2019) | 10.0°F (2008) | 0.16 in (2020) |
| December 22 | 55.9°F (2014) | 8.1°F (2022) | 0.35 in (2008) |
| December 23 | 54.0°F (2014) | 7.0°F (2022) | 0.19 in (2015) |
| December 24 | 57.0°F (2013) | 10.9°F (2022) | 0.25 in (2018) |
| December 25 | 48.0°F (2024) | 14.0°F (2017) | 0.44 in (2014) |
| December 26 | 51.1°F (2024) | 18.0°F (2008) | 0.50 in (2024) |
| December 27 | 57.0°F (2024) | 19.0°F (2021) | 0.44 in (2025) |
| December 28 | 57.0°F (2022) | 15.1°F (2021) | 0.12 in (2007) |
| December 29 | 62.1°F (2011) | 18.0°F (2021) | 0.65 in (2010) |
| December 30 | 55.9°F (2018) | 12.0°F (2021) | 0.70 in (2009) |
| December 31 | 50.0°F (2018) | 14.0°F (2014) | 0.13 in (2022) |