Santa Rosa, AZ climate
Santa Rosa has mild winters and scorching summers, with very little rain. A typical July afternoon reaches 103°, a January night drops to 39°.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Santa Rosa feels like
Winter
Spring
Summer
Fall
Santa Rosa 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 | 68° | 39° | 0.9" | 49° – 58° |
| February | 71° | 41° | 0.9" | 50° – 62° |
| March | 77° | 46° | 0.7" | 54° – 68° |
| April | 84° | 52° | 0.2" | 61° – 73° |
| May | 93° | 59° | 0.1" | 70° – 81° |
| June | 103° | 68° | 0.2" | 80° – 89° |
| July | 103° | 75° | 1.4" | 86° – 92° |
| August | 102° | 73° | 2.0" | 85° – 92° |
| September | 98° | 68° | 0.9" | 78° – 86° |
| October | 88° | 56° | 0.5" | 69° – 77° |
| November | 76° | 45° | 0.6" | 53° – 67° |
| December | 66° | 38° | 0.9" | 48° – 56° |
| Year | 86° | 55° | 9.1" |
“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 Santa Rosa
Santa Rosa gets 9 inches of rain and melted snow a year. August is the wettest month and May the driest.
How Santa Rosa 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 Santa Rosa averaged 2.0° warmer than the 1900s. The biggest change is in March (+2.8°). The shift is larger than in 93% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Santa Rosa’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. November swings the most: between 1991 and 2020 its average temperature ranged from 53° to 67°. July is the most reliable, staying within 5°.
Common questions about Santa Rosa’s climate
What is the coldest month in Santa Rosa?
December, with a typical high of 66° and a low of 38°.
What is the hottest month in Santa Rosa?
July, with a typical high of 103° and a low of 75°.
What is the rainiest month in Santa Rosa?
August, with 2.0 inches of rain and melted snow. The year totals 9 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Santa Rosa itself (about a 3-mile square). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.