Winchester, CA climate
Winchester has mild winters and hot summers, with very little rain. A typical July afternoon reaches 96°, a January night drops to 40°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Winchester feels like
Winter
Spring
Summer
Fall
Winchester 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 | 67° | 40° | 2.7" | 0 | 6 | 0 | 49° – 60° |
| February | 67° | 41° | 3.3" | 0 | 6 | 0 | 49° – 62° |
| March | 71° | 44° | 1.9" | 0 | 5 | 0 | 51° – 64° |
| April | 75° | 46° | 0.8" | 0 | 3 | 0 | 55° – 64° |
| May | 81° | 51° | 0.3" | 0 | 2 | 0 | 59° – 71° |
| June | 89° | 56° | 0.0" | 0 | 0 | 0 | 67° – 77° |
| July | 96° | 61° | 0.1" | 0 | 1 | 0 | 72° – 85° |
| August | 97° | 62° | 0.1" | 0 | 1 | 0 | 76° – 84° |
| September | 92° | 59° | 0.2" | 0 | 1 | 0 | 72° – 81° |
| October | 83° | 51° | 0.5" | 0 | 2 | 0 | 63° – 72° |
| November | 74° | 44° | 1.0" | 0 | 3 | 0 | 51° – 64° |
| December | 66° | 39° | 1.8" | 0 | 5 | 0 | 47° – 60° |
| Year | 80° | 49° | 12.6" | 0.0" | 35 | 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 Winchester
Winchester gets 13 inches of rain and melted snow a year. February is the wettest month and June the driest. Rain or snow falls on about 35 days a year.
About 315 frost-free days a year
In half of years the last 32° night comes by January 31 and the first one by December 10. That leaves about 315 frost-free days for gardens, longer than 96% of U.S. towns.
Heating and cooling a home in Winchester
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Winchester, 50% of that work is heating and 50% 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.
Winchester and its neighbors
Winchester borders 2 towns with climate data. January nights across them vary by 1.5°. Hemet has both the coldest January nights (38°) and the hottest July afternoons (97°). Winchester’s January low is 40° and its July high 96°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Winchester 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 Winchester averaged 2.2° warmer than the 1900s. The biggest change is in January (+3.3°). The shift is larger than in 97% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Winchester’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 51° to 64°. August is the most reliable, staying within 7°.
Common questions about Winchester’s climate
What is the coldest month in Winchester?
December, with a typical high of 66° and a low of 39°.
What is the hottest month in Winchester?
August, with a typical high of 97° and a low of 62°. About 120 days a year reach 90°.
How much snow does Winchester get?
Almost none. A normal year brings 0.0 inches.
When is the first frost in Winchester?
In half of years the first 32° night comes by December 10, and the last spring frost by January 31.
What is the rainiest month in Winchester?
February, with 3.3 inches of rain and melted snow. The year totals 13 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Winchester itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at San Jacinto, CA (8 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.