San Tan Valley Weather in December
Average highs run from 71°F on December 1 to 66°F on December 31, and lows from 43°F to 41°F. Normal precipitation for the month is 0.98 in over about 2 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
- 67°F
- Average low
- 41°F
- Precipitation
- 0.98 in
- Record high
- 85°FDec 1, 2021
- Record low
- 24°FDec 29, 2003
- Chance of a freeze
- 71%
- Daylight
- 10 h 07 min to 10 h 00 min
- Cloud cover
- 42%
- Humidity
- 47%
- Dew point
- 28°F
- Wind
- 8.1 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 | 71°F | 43°F | 85°F 2021 | 29°F 2004 | 6% |
| Dec 2 | 70°F | 43°F | 85°F 2017 | 27°F 2004 | 6% |
| Dec 3 | 70°F | 43°F | 83°F 2024 | 31°F 2004 | 6% |
| Dec 4 | 69°F | 43°F | 79°F 2003 | 32°F 2009 | 6% |
| Dec 5 | 69°F | 42°F | 81°F 2003 | 28°F 2009 | 7% |
| Dec 6 | 69°F | 42°F | 83°F 2023 | 28°F 2005 | 7% |
| Dec 7 | 68°F | 42°F | 81°F 2006 | 28°F 2013 | 7% |
| Dec 8 | 68°F | 42°F | 81°F 2010 | 29°F 2011 | 7% |
| Dec 9 | 68°F | 42°F | 82°F 2020 | 27°F 2013 | 7% |
| Dec 10 | 67°F | 41°F | 78°F 2015 | 29°F 2009 | 7% |
| Dec 11 | 67°F | 41°F | 79°F 2004 | 32°F 2009 | 7% |
| Dec 12 | 67°F | 41°F | 83°F 2010 | 32°F 2012 | 8% |
| Dec 13 | 67°F | 41°F | 83°F 2010 | 33°F 2003 | 8% |
| Dec 14 | 66°F | 41°F | 81°F 2025 | 31°F 2022 | 8% |
| Dec 15 | 66°F | 41°F | 82°F 2025 | 31°F 2007 | 8% |
| Dec 16 | 66°F | 41°F | 78°F 2023 | 27°F 2015 | 8% |
| Dec 17 | 66°F | 41°F | 80°F 2023 | 27°F 2005 | 9% |
| Dec 18 | 66°F | 41°F | 84°F 2024 | 31°F 2015 | 9% |
| Dec 19 | 66°F | 41°F | 81°F 2024 | 32°F 2006 | 9% |
| Dec 20 | 66°F | 41°F | 83°F 2024 | 29°F 2006 | 9% |
| Dec 21 | 66°F | 41°F | 81°F 2025 | 26°F 2006 | 9% |
| Dec 22 | 65°F | 41°F | 81°F 2025 | 27°F 2017 | 10% |
| Dec 23 | 65°F | 41°F | 78°F 2025 | 29°F 2007 | 10% |
| Dec 24 | 65°F | 41°F | 82°F 2005 | 31°F 2009 | 10% |
| Dec 25 | 65°F | 41°F | 77°F 2005 | 28°F 2004 | 10% |
| Dec 26 | 65°F | 41°F | 76°F 2005 | 27°F 2014 | 10% |
| Dec 27 | 65°F | 41°F | 74°F 2022 | 26°F 2014 | 10% |
| Dec 28 | 66°F | 41°F | 77°F 2017 | 26°F 2014 | 10% |
| Dec 29 | 66°F | 41°F | 78°F 2017 | 24°F 2003 | 10% |
| Dec 30 | 66°F | 41°F | 77°F 2017 | 26°F 2015 | 10% |
| Dec 31 | 66°F | 41°F | 74°F 2008 | 25°F 2010 | 10% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (MST).
- December 1
- sunrise 7:12 AM, sunset 5:19 PM
- December 31
- sunrise 7:29 AM, sunset 5:29 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00023027 (Florence), public domain. Records: NOAA GHCN-Daily, station USC00022782, 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 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.