Copperopolis, CA climate
Copperopolis has mild winters and hot summers, with very little rain. A typical July afternoon reaches 95°, a January night drops to 38°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Copperopolis feels like
Winter
Spring
Summer
Fall
Copperopolis weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 56° | 38° | 4.0" | 0 | 13 | 0 | 43° – 52° |
| February | 60° | 39° | 3.9" | 0 | 11 | 0 | 45° – 55° |
| March | 65° | 42° | 3.5" | 0.2" | 11 | 0 | 47° – 59° |
| April | 71° | 45° | 1.7" | 0 | 7 | 0 | 52° – 62° |
| May | 80° | 50° | 1.0" | 0 | 5 | 0 | 57° – 72° |
| June | 89° | 56° | 0.2" | 0 | 2 | 0 | 67° – 77° |
| July | 95° | 61° | 0.0" | 0 | 0 | 0 | 74° – 81° |
| August | 94° | 60° | 0.0" | 0 | 0 | 0 | 73° – 81° |
| September | 89° | 56° | 0.1" | 0 | 1 | 0 | 68° – 76° |
| October | 78° | 49° | 1.1" | 0 | 4 | 0 | 60° – 70° |
| November | 65° | 42° | 2.3" | 0 | 8 | 0 | 45° – 59° |
| December | 56° | 37° | 3.6" | 0 | 12 | 0 | 43° – 50° |
| Year | 75° | 48° | 21.4" | 0.2" | 75 | 0 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Copperopolis
Copperopolis gets 21 inches of rain and melted snow a year. January is the wettest month and July the driest. Rain or snow falls on about 75 days a year.
About 290 frost-free days a year
In half of years the last 32° night comes by February 20 and the first one by December 11. That leaves about 290 frost-free days for gardens, longer than 94% of U.S. towns.
Heating and cooling a home in Copperopolis
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Copperopolis, 58% of that work is heating and 42% is cooling.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
How Copperopolis compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Copperopolis averaged 1.1° warmer than the 1900s. The biggest change is in January (+2.1°). The shift is smaller than in 60% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Copperopolis’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. May swings the most: between 1991 and 2020 its average temperature ranged from 57° to 72°. December is the most reliable, staying within 7°.
Common questions about Copperopolis’s climate
What is the coldest month in Copperopolis?
December, with a typical high of 56° and a low of 37°.
What is the hottest month in Copperopolis?
July, with a typical high of 95° and a low of 61°. About 98 days a year reach 90°.
How much snow does Copperopolis get?
Almost none. A normal year brings 0.2 inches.
When is the first frost in Copperopolis?
In half of years the first 32° night comes by December 11, and the last spring frost by February 20.
What is the rainiest month in Copperopolis?
January, with 4.0 inches of rain and melted snow. The year totals 21 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Copperopolis itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at New Melones Dam Hq, CA (9 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.