Windsor climate

Windsor Weather in December

NOAA 1991-2020 normals for Santa Rosa Sonoma CO AP, 4.8 km from Windsor

Average highs run from 60°F on December 1 to 57°F on December 31, and lows from 38°F to 37°F. Normal precipitation for the month is 6.76 in over about 13 wet days.

December day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at Windsor, in °F, with the record for each date.020406080151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

December at a glance

Average high
58°F
Average low
37°F
Precipitation
6.76 in
Record high
78°FDec 19, 1999
Record low
19°FDec 9, 2013
Chance of a freeze
85%
Daylight
9 h 41 min to 9 h 31 min
Cloud cover
58%
Humidity
83%
Dew point
43°F
Wind
8.1 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.

DateNormal highNormal lowRecord highRecord lowChance wetChance of snow
Dec 160°F38°F73°F 201123°F 200737%0%
Dec 259°F38°F75°F 201126°F 200438%0%
Dec 359°F38°F69°F 202526°F 200438%0%
Dec 459°F38°F69°F 202026°F 200438%0%
Dec 559°F37°F70°F 202424°F 201339%0%
Dec 658°F37°F71°F 202422°F 201339%0%
Dec 758°F37°F77°F 202025°F 200939%0%
Dec 858°F37°F74°F 202021°F 200939%0%
Dec 958°F37°F69°F 201219°F 201340%0%
Dec 1058°F37°F68°F 201222°F 201340%0%
Dec 1158°F37°F67°F 199924°F 201340%0%
Dec 1258°F37°F67°F 201824°F 201340%0%
Dec 1357°F37°F63°F 201325°F 201341%0%
Dec 1457°F37°F66°F 201725°F 200841%0%
Dec 1557°F37°F69°F 199828°F 199941%0%
Dec 1657°F37°F70°F 201126°F 202241%0%
Dec 1757°F37°F69°F 201724°F 200841%0%
Dec 1857°F37°F64°F 199824°F 200841%0%
Dec 1957°F37°F78°F 199924°F 200641%0%
Dec 2057°F37°F69°F 199926°F 200641%0%
Dec 2157°F37°F77°F 199921°F 199841%0%
Dec 2257°F37°F70°F 199921°F 199841%0%
Dec 2357°F37°F70°F 200421°F 199841%0%
Dec 2457°F37°F69°F 201323°F 199841%0%
Dec 2557°F37°F67°F 201326°F 199841%0%
Dec 2657°F37°F66°F 201326°F 201141%0%
Dec 2757°F37°F63°F 199927°F 201541%0%
Dec 2857°F37°F71°F 201323°F 201341%0%
Dec 2957°F37°F66°F 201327°F 201341%0%
Dec 3057°F37°F65°F 201826°F 201341%0%
Dec 3157°F37°F64°F 201428°F 201241%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Windsor, in percent, and of at least 0.1 inch of snowfall.010203040501102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (PST).

December 1
sunrise 7:10 AM, sunset 4:51 PM
December 31
sunrise 7:29 AM, sunset 5:00 PM

Every day of December: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00023213 (Santa Rosa Sonoma CO AP), public domain. Records: NOAA GHCN-Daily, station USW00023213, 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.