Jefferson climate

Jefferson Weather in December

NOAA 1991-2020 normals for Corvallis State Univ, 17.1 km from Jefferson

Average highs run from 49°F on December 1 to 46°F on December 31, and lows from 35°F to 34°F. Normal precipitation for the month is 7.71 in over about 22 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 Jefferson, in °F, with the record for each date.-20020406080151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

December at a glance

Average high
47°F
Average low
34°F
Precipitation
7.71 in
Snowfall
0.7 in
Record high
66°FDec 23, 1950
Record low
-8°FDec 25, 1924
Chance of a freeze
100%
Daylight
9 h 04 min to 8 h 52 min
Cloud cover
75%
Humidity
93%
Dew point
38°F
Wind
6.0 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 149°F35°F65°F 193920°F 195671%1%
Dec 249°F35°F65°F 202118°F 198571%1%
Dec 348°F35°F63°F 195824°F 197671%1%
Dec 448°F35°F63°F 193923°F 200971%1%
Dec 548°F35°F63°F 202318°F 201371%1%
Dec 648°F35°F61°F 202320°F 197271%1%
Dec 748°F34°F63°F 193812°F 197271%1%
Dec 847°F34°F62°F 19152°F 201371%1%
Dec 947°F34°F62°F 1895-6°F 197271%1%
Dec 1047°F34°F64°F 1993-2°F 197271%1%
Dec 1147°F34°F63°F 2014-4°F 197271%1%
Dec 1247°F34°F62°F 19218°F 197271%1%
Dec 1347°F34°F61°F 19600°F 197271%1%
Dec 1447°F34°F61°F 197710°F 197271%1%
Dec 1546°F34°F59°F 200213°F 193271%1%
Dec 1646°F34°F58°F 195015°F 201671%1%
Dec 1746°F34°F59°F 197410°F 196471%1%
Dec 1846°F34°F63°F 19795°F 192471%1%
Dec 1946°F34°F61°F 18966°F 192471%1%
Dec 2046°F33°F60°F 190011°F 199070%1%
Dec 2146°F33°F63°F 19948°F 199070%1%
Dec 2246°F33°F61°F 19555°F 192470%1%
Dec 2346°F33°F66°F 195011°F 198370%1%
Dec 2446°F33°F61°F 19502°F 192470%1%
Dec 2546°F34°F60°F 2005-8°F 192470%1%
Dec 2646°F34°F61°F 198019°F 194870%1%
Dec 2746°F34°F60°F 19178°F 192470%1%
Dec 2846°F34°F63°F 191720°F 197870%1%
Dec 2946°F34°F66°F 191714°F 199070%1%
Dec 3046°F34°F63°F 191711°F 196869%1%
Dec 3146°F34°F66°F 198010°F 196869%1%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Jefferson, in percent, and of at least 0.1 inch of snowfall.0204060801102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (PST).

December 1
sunrise 7:29 AM, sunset 4:33 PM
December 31
sunrise 7:49 AM, sunset 4:41 PM

Every day of December: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00351862 (Corvallis State Univ), public domain. Records: NOAA GHCN-Daily, station USC00351862, 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.