San Carlos, AZ climate
San Carlos has mild winters and scorching summers, with very little rain. A typical July afternoon reaches 101°, a January night drops to 32°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in San Carlos feels like
Winter
Spring
Summer
Fall
San Carlos 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 | 61° | 32° | 1.2" | 0 | 5 | 0 | 42° – 52° |
| February | 65° | 36° | 1.2" | 0 | 5 | 0 | 45° – 57° |
| March | 73° | 40° | 0.9" | 0 | 4 | 0 | 49° – 62° |
| April | 81° | 46° | 0.4" | 0 | 2 | 0 | 57° – 69° |
| May | 90° | 53° | 0.3" | 0 | 2 | 0 | 65° – 78° |
| June | 100° | 62° | 0.2" | 0 | 1 | 0 | 75° – 84° |
| July | 101° | 71° | 2.0" | 0 | 6 | 0 | 83° – 89° |
| August | 99° | 70° | 1.9" | 0 | 7 | 0 | 82° – 89° |
| September | 94° | 63° | 1.1" | 0 | 5 | 0 | 75° – 82° |
| October | 84° | 50° | 0.9" | 0 | 3 | 0 | 63° – 72° |
| November | 71° | 38° | 0.9" | 0 | 3 | 0 | 48° – 62° |
| December | 60° | 31° | 1.1" | 0 | 5 | 0 | 41° – 50° |
| Year | 82° | 49° | 12.1" | 0.0" | 48 | 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 San Carlos
San Carlos gets 12 inches of rain and melted snow a year. July is the wettest month and June the driest. Rain or snow falls on about 48 days a year.
About 247 frost-free days a year
In half of years the last 32° night comes by March 13 and the first one by November 19. That leaves about 247 frost-free days for gardens, longer than 90% of U.S. towns.
Heating and cooling a home in San Carlos
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In San Carlos, 51% of that work is heating and 49% 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 San Carlos 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 San Carlos averaged 1.9° warmer than the 1900s. The biggest change is in March (+2.7°). The shift is larger than in 90% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at San Carlos’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 48° to 62°. July is the most reliable, staying within 6°.
Common questions about San Carlos’s climate
What is the coldest month in San Carlos?
December, with a typical high of 60° and a low of 31°.
What is the hottest month in San Carlos?
July, with a typical high of 101° and a low of 71°. About 138 days a year reach 90°.
How much snow does San Carlos get?
Almost none. A normal year brings 0.0 inches.
When is the first frost in San Carlos?
In half of years the first 32° night comes by November 19, and the last spring frost by March 13.
What is the rainiest month in San Carlos?
July, with 2.0 inches of rain and melted snow. The year totals 12 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for San Carlos itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at San Carlos Reservoir, AZ (12 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.