Copperopolis climate

Copperopolis Weather in December

NOAA 1991-2020 normals for New Melones Dam Hq, 13.9 km from Copperopolis

Average highs run from 60°F on December 1 to 57°F on December 31, and lows from 40°F to 38°F. Normal precipitation for the month is 5.16 in over about 12 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 Copperopolis, in °F, with the record for each date.020406080151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

December at a glance

Average high
57°F
Average low
38°F
Precipitation
5.16 in
Record high
76°FDec 2, 2021
Record low
19°FDec 16, 2008
Chance of a freeze
78%
Daylight
9 h 43 min to 9 h 35 min
Cloud cover
59%
Humidity
68%
Dew point
34°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 160°F40°F74°F 199531°F 200435%0%
Dec 260°F39°F76°F 202131°F 200435%0%
Dec 359°F39°F72°F 201331°F 200435%0%
Dec 459°F39°F70°F 202029°F 201336%0%
Dec 559°F39°F69°F 202028°F 201336%0%
Dec 659°F39°F70°F 202028°F 201336%0%
Dec 758°F38°F70°F 200630°F 201337%0%
Dec 858°F38°F72°F 200625°F 200937%0%
Dec 958°F38°F73°F 200626°F 200937%0%
Dec 1058°F38°F69°F 202027°F 200938%0%
Dec 1158°F38°F72°F 199530°F 201338%0%
Dec 1257°F38°F69°F 201432°F 199238%0%
Dec 1357°F38°F69°F 201930°F 199238%0%
Dec 1457°F38°F65°F 202530°F 199238%0%
Dec 1557°F37°F68°F 202526°F 201539%0%
Dec 1657°F37°F66°F 201719°F 200839%0%
Dec 1757°F37°F74°F 202329°F 201539%0%
Dec 1857°F37°F71°F 201328°F 200839%0%
Dec 1957°F37°F69°F 201328°F 199239%0%
Dec 2057°F37°F67°F 200428°F 199339%0%
Dec 2157°F37°F68°F 200525°F 199839%0%
Dec 2257°F37°F67°F 199924°F 199839%0%
Dec 2357°F37°F67°F 199924°F 199839%0%
Dec 2457°F37°F69°F 200524°F 199839%0%
Dec 2557°F37°F72°F 200528°F 199239%0%
Dec 2657°F37°F73°F 201327°F 199239%0%
Dec 2757°F37°F71°F 201327°F 199239%0%
Dec 2857°F37°F69°F 199922°F 199339%0%
Dec 2957°F38°F66°F 199925°F 199339%0%
Dec 3057°F38°F69°F 201325°F 199340%0%
Dec 3157°F38°F68°F 201328°F 201040%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Copperopolis, in percent, and of at least 0.1 inch of snowfall.0102030401102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (PST).

December 1
sunrise 7:00 AM, sunset 4:43 PM
December 31
sunrise 7:18 AM, sunset 4:53 PM

Every day of December: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00046174 (New Melones Dam Hq), public domain. Records: NOAA GHCN-Daily, station USC00046174, 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.