Three Rocks, CA climate
Three Rocks has mild winters and hot summers, with very little rain. A typical July afternoon reaches 96°, a January night drops to 39°.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Three Rocks feels like
Winter
Spring
Summer
Fall
Three Rocks weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | 30-yr range |
|---|---|---|---|---|
| January | 56° | 39° | 1.2" | 43° – 53° |
| February | 62° | 41° | 1.1" | 45° – 58° |
| March | 68° | 45° | 0.9" | 49° – 65° |
| April | 74° | 47° | 0.4" | 55° – 65° |
| May | 83° | 54° | 0.3" | 61° – 76° |
| June | 90° | 60° | 0.0" | 70° – 80° |
| July | 96° | 65° | 0.0" | 76° – 85° |
| August | 95° | 64° | 0.0" | 74° – 83° |
| September | 90° | 59° | 0.1" | 70° – 78° |
| October | 80° | 51° | 0.3" | 62° – 70° |
| November | 66° | 43° | 0.4" | 46° – 62° |
| December | 56° | 38° | 0.8" | 43° – 52° |
| Year | 76° | 50° | 5.5" |
“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 Rocks
Three Rocks gets 5 inches of rain and melted snow a year. January is the wettest month and July the driest.
About 271 frost-free days a year
In half of years the last 32° night comes by February 27 and the first one by November 26. That leaves about 271 frost-free days for gardens, longer than 93% of U.S. towns.
Heating and cooling a home in Three Rocks
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Three Rocks, 53% of that work is heating and 47% 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 Rocks 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 Rocks averaged 1.6° warmer than the 1900s. The biggest change is in September (+2.3°). The shift is larger than in 77% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Three Rocks’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. March swings the most: between 1991 and 2020 its average temperature ranged from 49° to 65°. December is the most reliable, staying within 8°.
Common questions about Three Rocks’s climate
What is the coldest month in Three Rocks?
December, with a typical high of 56° and a low of 38°.
What is the hottest month in Three Rocks?
July, with a typical high of 96° and a low of 65°. About 114 days a year reach 90°.
When is the first frost in Three Rocks?
In half of years the first 32° night comes by November 26, and the last spring frost by February 27.
What is the rainiest month in Three Rocks?
January, with 1.2 inches of rain and melted snow. The year totals 5 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Three Rocks itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Five Points 5 Ssw, CA (16 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.