First Mesa, AZ climate
First Mesa has chilly winters and warm summers, with very little rain. A typical July afternoon reaches 92°, a January night drops to 17°.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in First Mesa feels like
Winter
Spring
Summer
Fall
First Mesa 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 | 45° | 17° | 0.7" | 24° – 36° |
| February | 51° | 22° | 0.7" | 31° – 42° |
| March | 59° | 28° | 0.7" | 39° – 48° |
| April | 67° | 33° | 0.4" | 45° – 55° |
| May | 77° | 41° | 0.4" | 53° – 64° |
| June | 88° | 50° | 0.1" | 64° – 73° |
| July | 92° | 58° | 1.0" | 70° – 78° |
| August | 89° | 57° | 1.3" | 69° – 78° |
| September | 82° | 48° | 0.9" | 61° – 68° |
| October | 70° | 36° | 0.8" | 49° – 57° |
| November | 56° | 25° | 0.5" | 33° – 47° |
| December | 44° | 17° | 0.6" | 24° – 37° |
| Year | 68° | 36° | 7.9" |
“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 First Mesa
First Mesa gets 8 inches of rain and melted snow a year. August is the wettest month and June the driest.
About 147 frost-free days a year
In half of years the last 32° night comes by May 16 and the first one by October 10. That leaves about 147 frost-free days for gardens, shorter than 83% of U.S. towns.
Heating and cooling a home in First Mesa
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In First Mesa, 91% of that work is heating and 9% is cooling, so the furnace matters far more than the air conditioner.
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 First Mesa 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 First Mesa averaged 1.3° warmer than the 1900s. The biggest change is in March (+2.5°). The shift is larger than in 57% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at First Mesa’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 33° to 47°. September is the most reliable, staying within 8°.
Common questions about First Mesa’s climate
What is the coldest month in First Mesa?
December, with a typical high of 44° and a low of 17°.
What is the hottest month in First Mesa?
July, with a typical high of 92° and a low of 58°. About 31 days a year reach 90°.
When is the first frost in First Mesa?
In half of years the first 32° night comes by October 10, and the last spring frost by May 16.
What is the rainiest month in First Mesa?
August, with 1.3 inches of rain and melted snow. The year totals 8 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for First Mesa itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Keams Canyon, AZ (10 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.