December weather in Hillsboro, OR
The average temperature in Hillsboro in December is 39.8°F (33.3°F–46.2°F). Average precipitation: 6.05 inches.
December is a winter month in Hillsboro, and is cooler than the annual average of 52.5°F. Daily temperatures swing about 12.9°F between overnight low and afternoon high. Expect about 20 days with precipitation. Daylight averages about 8h 31m. For travel, December is a wet month.
Avg High
46.2°F
Avg Low
33.3°F
Precipitation
6.05 in
Daylight
8h 31m
December records in Hillsboro
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 57.9°F (2013) | 25.0°F (2002) | 1.05 in (2001) |
| December 2 | 57.0°F (2008) | 22.1°F (2014) | 2.15 in (2007) |
| December 3 | 57.0°F (2007) | 24.3°F (2011) | 2.07 in (2007) |
| December 4 | 63.0°F (2023) | 19.2°F (2013) | 1.07 in (2014) |
| December 5 | 61.0°F (2023) | 15.3°F (2013) | 0.90 in (2023) |
| December 6 | 57.0°F (2023) | 24.3°F (2013) | 1.38 in (2023) |
| December 7 | 61.0°F (2015) | 12.2°F (2013) | 1.98 in (2015) |
| December 8 | 59.0°F (2015) | 9.1°F (2013) | 1.38 in (2015) |
| December 9 | 60.1°F (2014) | 7.2°F (2009) | 1.23 in (2010) |
| December 10 | 60.1°F (2025) | 8.2°F (2009) | 0.79 in (2015) |
| December 11 | 61.0°F (2014) | 8.2°F (2009) | 1.23 in (2010) |
| December 12 | 60.1°F (1998) | 20.1°F (2013) | 0.73 in (2015) |
| December 13 | 57.0°F (2010) | 21.2°F (2011) | 1.53 in (2003) |
| December 14 | 57.9°F (2002) | 19.9°F (2005) | 1.76 in (2006) |
| December 15 | 63.0°F (2025) | 19.9°F (2005) | 0.92 in (2002) |
| December 16 | 59.0°F (2025) | 12.2°F (2008) | 0.87 in (2012) |
| December 17 | 57.9°F (2024) | 19.2°F (2022) | 1.75 in (2015) |
| December 18 | 57.9°F (2024) | 23.2°F (2016) | 1.97 in (2025) |
| December 19 | 54.0°F (2019) | 21.0°F (1998) | 1.13 in (2005) |
| December 20 | 57.0°F (2014) | 12.9°F (1998) | 1.24 in (2020) |
| December 21 | 59.0°F (2020) | 12.0°F (1998) | 0.96 in (2005) |
| December 22 | 57.0°F (1999) | 3.9°F (1998) | 0.79 in (2005) |
| December 23 | 54.0°F (2014) | 3.9°F (1998) | 0.71 in (2015) |
| December 24 | 57.0°F (2005) | 22.1°F (2020) | 0.94 in (2006) |
| December 25 | 57.0°F (2005) | 22.1°F (2009) | 0.95 in (2024) |
| December 26 | 57.0°F (2022) | 25.0°F (1999) | 2.50 in (2022) |
| December 27 | 55.9°F (2022) | 24.3°F (2021) | 2.19 in (1998) |
| December 28 | 55.0°F (2011) | 23.0°F (1999) | 1.06 in (2005) |
| December 29 | 55.0°F (2017) | 21.0°F (1999) | 0.79 in (2005) |
| December 30 | 54.0°F (1998) | 21.2°F (2014) | 1.36 in (2002) |
| December 31 | 51.1°F (1998) | 19.2°F (2014) | 0.80 in (2009) |