Three Rivers, CA climate
Three Rivers has mild winters and hot summers, with very little rain. A typical July afternoon reaches 98°, a January night drops to 36°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Three Rivers feels like
Winter
Spring
Summer
Fall
Three Rivers 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 | 59° | 36° | 3.8" | 0 | 8 | 0 | 43° – 54° |
| February | 63° | 39° | 3.5" | 0 | 9 | 0 | 45° – 58° |
| March | 69° | 42° | 3.1" | 0 | 8 | 0 | 48° – 63° |
| April | 74° | 45° | 1.8" | 0 | 6 | 0 | 55° – 65° |
| May | 83° | 52° | 1.0" | 0 | 3 | 0 | 58° – 75° |
| June | 92° | 59° | 0.2" | 0 | 1 | 0 | 69° – 80° |
| July | 98° | 65° | 0.0" | 0 | 1 | 0 | 78° – 85° |
| August | 98° | 64° | 0.0" | 0 | 0 | 0 | 77° – 84° |
| September | 92° | 58° | 0.1" | 0 | 1 | 0 | 71° – 79° |
| October | 81° | 49° | 1.0" | 0 | 3 | 0 | 61° – 71° |
| November | 67° | 41° | 1.6" | 0 | 5 | 0 | 46° – 59° |
| December | 58° | 36° | 2.9" | 0 | 8 | 0 | 44° – 52° |
| Year | 78° | 49° | 19.1" | 0.0" | 51 | 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 Three Rivers
Three Rivers gets 19 inches of rain and melted snow a year. January is the wettest month and August the driest. Rain or snow falls on about 51 days a year.
About 249 frost-free days a year
In half of years the last 32° night comes by March 16 and the first one by November 26. That leaves about 249 frost-free days for gardens, longer than 90% of U.S. towns.
Heating and cooling a home in Three Rivers
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Three Rivers, 60% of that work is heating and 40% 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 Three Rivers 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 Three Rivers averaged 1.7° warmer than the 1900s. The biggest change is in September (+2.5°). The shift is larger than in 79% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Three Rivers’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 58° to 75°. August is the most reliable, staying within 7°.
Common questions about Three Rivers’s climate
What is the coldest month in Three Rivers?
December, with a typical high of 58° and a low of 36°.
What is the hottest month in Three Rivers?
July, with a typical high of 98° and a low of 65°. About 114 days a year reach 90°.
How much snow does Three Rivers get?
Almost none. A normal year brings 0.0 inches.
When is the first frost in Three Rivers?
In half of years the first 32° night comes by November 26, and the last spring frost by March 16.
What is the rainiest month in Three Rivers?
January, with 3.8 inches of rain and melted snow. The year totals 19 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Three Rivers itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Three Rivers Edison Ph 1, CA (2 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.