Hillsboro Weather in December
Average highs run from 48°F on December 1 to 46°F on December 31, and lows from 34°F to 33°F. Normal precipitation for the month is 6.05 in over about 20 wet days.
December day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
December at a glance
- Average high
- 46°F
- Average low
- 33°F
- Precipitation
- 6.05 in
- Snowfall
- 1.3 in
- Record high
- 63°FDec 4, 2023
- Record low
- 4°FDec 22, 1998
- Chance of a freeze
- 100%
- Daylight
- 8 h 58 min to 8 h 46 min
- Cloud cover
- 78%
- Humidity
- 94%
- Dew point
- 37°F
- Wind
- 5.6 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| Dec 1 | 48°F | 34°F | 58°F 2013 | 25°F 2002 | 64% | 1% |
| Dec 2 | 48°F | 34°F | 57°F 2008 | 22°F 2014 | 64% | 1% |
| Dec 3 | 48°F | 34°F | 57°F 2007 | 24°F 2011 | 64% | 1% |
| Dec 4 | 48°F | 34°F | 63°F 2023 | 19°F 2013 | 64% | 1% |
| Dec 5 | 47°F | 34°F | 61°F 2023 | 15°F 2013 | 64% | 1% |
| Dec 6 | 47°F | 34°F | 57°F 2023 | 24°F 2013 | 64% | 1% |
| Dec 7 | 47°F | 34°F | 61°F 2015 | 12°F 2013 | 64% | 1% |
| Dec 8 | 47°F | 34°F | 59°F 2015 | 9°F 2013 | 64% | 1% |
| Dec 9 | 47°F | 34°F | 60°F 2014 | 7°F 2009 | 64% | 1% |
| Dec 10 | 46°F | 33°F | 60°F 2025 | 8°F 2009 | 64% | 1% |
| Dec 11 | 46°F | 33°F | 61°F 2014 | 8°F 2009 | 64% | 1% |
| Dec 12 | 46°F | 33°F | 60°F 1998 | 20°F 2013 | 64% | 1% |
| Dec 13 | 46°F | 33°F | 57°F 2010 | 21°F 2011 | 64% | 1% |
| Dec 14 | 46°F | 33°F | 58°F 2002 | 20°F 2005 | 64% | 1% |
| Dec 15 | 46°F | 33°F | 63°F 2025 | 20°F 2005 | 65% | 1% |
| Dec 16 | 46°F | 33°F | 59°F 2025 | 12°F 2008 | 65% | 1% |
| Dec 17 | 46°F | 33°F | 58°F 2024 | 19°F 2022 | 65% | 1% |
| Dec 18 | 46°F | 33°F | 58°F 2024 | 23°F 2016 | 65% | 1% |
| Dec 19 | 46°F | 33°F | 54°F 2019 | 21°F 1998 | 65% | 1% |
| Dec 20 | 46°F | 33°F | 57°F 2014 | 13°F 1998 | 65% | 1% |
| Dec 21 | 46°F | 33°F | 59°F 2020 | 12°F 1998 | 65% | 1% |
| Dec 22 | 46°F | 33°F | 57°F 1999 | 4°F 1998 | 65% | 1% |
| Dec 23 | 46°F | 33°F | 54°F 2014 | 4°F 1998 | 65% | 1% |
| Dec 24 | 46°F | 33°F | 57°F 2005 | 22°F 2020 | 65% | 1% |
| Dec 25 | 46°F | 33°F | 57°F 2005 | 22°F 2009 | 65% | 1% |
| Dec 26 | 46°F | 33°F | 57°F 2022 | 25°F 1999 | 65% | 1% |
| Dec 27 | 46°F | 33°F | 56°F 2022 | 24°F 2021 | 65% | 1% |
| Dec 28 | 46°F | 33°F | 55°F 2011 | 23°F 1999 | 65% | 1% |
| Dec 29 | 46°F | 33°F | 55°F 2017 | 21°F 1999 | 65% | 1% |
| Dec 30 | 46°F | 33°F | 54°F 1998 | 21°F 2014 | 65% | 1% |
| Dec 31 | 46°F | 33°F | 51°F 1998 | 19°F 2014 | 65% | 1% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (PST).
- December 1
- sunrise 7:32 AM, sunset 4:30 PM
- December 31
- sunrise 7:52 AM, sunset 4:38 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00094261 (Portland-Hillsboro AP), public domain. Records: NOAA GHCN-Daily, station USW00094261, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.