Union City Weather in December
Average highs run from 60°F on December 1 to 58°F on December 31, and lows from 44°F to 42°F. Normal precipitation for the month is 2.97 in over about 10 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
- 58°F
- Average low
- 43°F
- Precipitation
- 2.97 in
- Record high
- 76°FDec 7, 2020
- Record low
- 27°FDec 23, 1998
- Chance of a freeze
- 43%
- Daylight
- 9 h 46 min to 9 h 37 min
- Cloud cover
- 52%
- Humidity
- 80%
- Dew point
- 41°F
- Wind
- 6.7 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Dec 1 | 60°F | 44°F | 71°F 2014 | 37°F 2004 | 30% |
| Dec 2 | 60°F | 44°F | 73°F 2011 | 36°F 2004 | 30% |
| Dec 3 | 60°F | 43°F | 67°F 2007 | 36°F 2004 | 30% |
| Dec 4 | 60°F | 43°F | 70°F 2014 | 35°F 2004 | 31% |
| Dec 5 | 59°F | 43°F | 70°F 2014 | 31°F 2013 | 31% |
| Dec 6 | 59°F | 43°F | 70°F 2014 | 34°F 2009 | 31% |
| Dec 7 | 59°F | 43°F | 76°F 2020 | 33°F 2009 | 31% |
| Dec 8 | 59°F | 43°F | 72°F 2020 | 31°F 2009 | 31% |
| Dec 9 | 59°F | 43°F | 70°F 2020 | 28°F 2013 | 32% |
| Dec 10 | 59°F | 43°F | 71°F 2012 | 31°F 2013 | 32% |
| Dec 11 | 59°F | 43°F | 67°F 2017 | 35°F 2013 | 32% |
| Dec 12 | 58°F | 43°F | 66°F 2018 | 34°F 2013 | 32% |
| Dec 13 | 58°F | 43°F | 65°F 2018 | 36°F 2007 | 33% |
| Dec 14 | 58°F | 42°F | 73°F 2017 | 35°F 2007 | 33% |
| Dec 15 | 58°F | 42°F | 68°F 1998 | 35°F 2013 | 33% |
| Dec 16 | 58°F | 42°F | 70°F 1998 | 34°F 2013 | 33% |
| Dec 17 | 58°F | 42°F | 68°F 2017 | 34°F 2008 | 33% |
| Dec 18 | 58°F | 42°F | 69°F 2023 | 32°F 2016 | 33% |
| Dec 19 | 58°F | 42°F | 74°F 1999 | 31°F 2006 | 33% |
| Dec 20 | 58°F | 42°F | 71°F 1999 | 33°F 1998 | 33% |
| Dec 21 | 58°F | 42°F | 73°F 1999 | 29°F 1998 | 33% |
| Dec 22 | 58°F | 42°F | 65°F 2005 | 29°F 1998 | 33% |
| Dec 23 | 58°F | 42°F | 69°F 2024 | 27°F 1998 | 33% |
| Dec 24 | 58°F | 42°F | 68°F 2005 | 29°F 1998 | 33% |
| Dec 25 | 58°F | 42°F | 65°F 2013 | 33°F 1998 | 33% |
| Dec 26 | 58°F | 42°F | 64°F 2006 | 34°F 2008 | 33% |
| Dec 27 | 58°F | 42°F | 66°F 1999 | 31°F 2015 | 33% |
| Dec 28 | 58°F | 42°F | 71°F 2023 | 37°F 2003 | 33% |
| Dec 29 | 58°F | 42°F | 70°F 2013 | 34°F 2015 | 33% |
| Dec 30 | 58°F | 42°F | 63°F 2013 | 35°F 2010 | 33% |
| Dec 31 | 58°F | 42°F | 63°F 2001 | 34°F 2007 | 33% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (PST).
- December 1
- sunrise 7:04 AM, sunset 4:50 PM
- December 31
- sunrise 7:23 AM, sunset 5:00 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00043244 (Fremont), public domain. Records: NOAA GHCN-Daily, station USW00093228, 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.