O'Brien Weather in December
Average highs run from 50°F on December 1 to 47°F on December 31, and lows from 34°F to 32°F. Normal precipitation for the month is 12.95 in over about 19 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
- 47°F
- Average low
- 33°F
- Precipitation
- 12.95 in
- Snowfall
- 1.9 in
- Record high
- 72°FDec 12, 2017
- Record low
- 24°FDec 8, 2009
- Chance of a freeze
- 99%
- Daylight
- 9 h 20 min to 9 h 10 min
- Cloud cover
- 72%
- Humidity
- 91%
- Dew point
- 36°F
- Wind
- 5.1 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 | 50°F | 34°F | 65°F 2008 | 30°F 2007 | 58% | 1% |
| Dec 2 | 49°F | 34°F | 63°F 2014 | 34°F 2007 | 58% | 1% |
| Dec 3 | 49°F | 34°F | 63°F 2004 | 35°F 2009 | 59% | 1% |
| Dec 4 | 49°F | 34°F | 62°F 2019 | 35°F 2005 | 59% | 2% |
| Dec 5 | 49°F | 34°F | 60°F 2002 | 32°F 2013 | 59% | 2% |
| Dec 6 | 48°F | 33°F | 65°F 2014 | 29°F 2009 | 59% | 2% |
| Dec 7 | 48°F | 33°F | 65°F 2017 | 29°F 2009 | 59% | 2% |
| Dec 8 | 48°F | 33°F | 66°F 2014 | 24°F 2009 | 59% | 2% |
| Dec 9 | 48°F | 33°F | 70°F 2017 | 25°F 2009 | 59% | 2% |
| Dec 10 | 48°F | 33°F | 63°F 2014 | 26°F 2009 | 59% | 2% |
| Dec 11 | 48°F | 33°F | 63°F 2014 | 31°F 2009 | 59% | 3% |
| Dec 12 | 47°F | 33°F | 72°F 2017 | 35°F 2007 | 59% | 3% |
| Dec 13 | 47°F | 33°F | 62°F 2004 | 34°F 2007 | 59% | 3% |
| Dec 14 | 47°F | 33°F | 58°F 2017 | 34°F 2007 | 59% | 3% |
| Dec 15 | 47°F | 32°F | 59°F 2017 | 31°F 2005 | 59% | 3% |
| Dec 16 | 47°F | 32°F | 59°F 2017 | 30°F 2008 | 59% | 3% |
| Dec 17 | 47°F | 32°F | 58°F 2013 | 30°F 2008 | 59% | 3% |
| Dec 18 | 47°F | 32°F | 57°F 2009 | 32°F 2006 | 59% | 3% |
| Dec 19 | 47°F | 32°F | 65°F 2003 | 33°F 2006 | 59% | 3% |
| Dec 20 | 47°F | 32°F | 64°F 2005 | 33°F 2006 | 59% | 4% |
| Dec 21 | 47°F | 32°F | 64°F 2005 | 32°F 2006 | 58% | 4% |
| Dec 22 | 47°F | 32°F | 66°F 2016 | 34°F 2006 | 58% | 4% |
| Dec 23 | 46°F | 32°F | 63°F 2013 | 32°F 2009 | 58% | 4% |
| Dec 24 | 46°F | 32°F | 60°F 2004 | 32°F 2009 | 58% | 4% |
| Dec 25 | 46°F | 32°F | 68°F 2004 | 32°F 2007 | 58% | 4% |
| Dec 26 | 47°F | 32°F | 61°F 2004 | 32°F 2003 | 58% | 4% |
| Dec 27 | 47°F | 32°F | 58°F 2013 | 32°F 2006 | 58% | 4% |
| Dec 28 | 47°F | 32°F | 59°F 2005 | 33°F 2006 | 58% | 4% |
| Dec 29 | 47°F | 32°F | 68°F 2013 | 34°F 2006 | 58% | 4% |
| Dec 30 | 47°F | 32°F | 63°F 2013 | 34°F 2008 | 57% | 4% |
| Dec 31 | 47°F | 32°F | 63°F 2013 | 31°F 2007 | 57% | 4% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (PST).
- December 1
- sunrise 7:24 AM, sunset 4:44 PM
- December 31
- sunrise 7:43 AM, sunset 4:53 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00351448 (Cave Junction 1 Wnw), public domain. Records: NOAA GHCN-Daily, station USC00351058, 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.