Ajo, AZ climate
Ajo has warm winters and scorching summers, with very little rain. A typical July afternoon reaches 104°, a January night drops to 43°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Ajo feels like
Winter
Spring
Summer
Fall
Ajo 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° | 43° | 0.7" | 0.1" | 2 | 0 | 51° – 61° |
| February | 71° | 45° | 0.7" | 0 | 3 | 0 | 51° – 63° |
| March | 77° | 50° | 0.7" | 0 | 2 | 0 | 57° – 71° |
| April | 84° | 55° | 0.2" | 0 | 1 | 0 | 63° – 75° |
| May | 92° | 62° | 0.1" | 0 | 1 | 0 | 71° – 83° |
| June | 101° | 71° | 0.0" | 0 | 0 | 0 | 81° – 91° |
| July | 104° | 78° | 0.9" | 0 | 3 | 0 | 87° – 94° |
| August | 103° | 77° | 1.7" | 0 | 5 | 0 | 86° – 95° |
| September | 98° | 72° | 0.7" | 0 | 2 | 0 | 82° – 90° |
| October | 88° | 61° | 0.4" | 0 | 1 | 0 | 70° – 80° |
| November | 76° | 50° | 0.4" | 0 | 1 | 0 | 54° – 69° |
| December | 66° | 43° | 0.7" | 0 | 3 | 0 | 51° – 59° |
| Year | 86° | 59° | 7.2" | 0.1" | 23 | 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 Ajo
Ajo gets 7 inches of rain and melted snow a year. August is the wettest month and June the driest. Rain or snow falls on about 23 days a year.
A year-round growing season
Heating and cooling a home in Ajo
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Ajo, 20% of that work is heating and 80% is cooling, so air conditioning is the bigger bill.
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 Ajo 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 Ajo averaged 2.5° warmer than the 1900s. The biggest change is in March (+3.5°). The shift is larger than in 100% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Ajo’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 54° to 69°. July is the most reliable, staying within 8°.
Common questions about Ajo’s climate
What is the coldest month in Ajo?
December, with a typical high of 66° and a low of 43°.
What is the hottest month in Ajo?
July, with a typical high of 104° and a low of 78°. About 168 days a year reach 90°.
How much snow does Ajo get?
Almost none. A normal year brings 0.1 inches.
When is the first frost in Ajo?
Frost is uncommon. Only 81% of years see a night at 32° or below.
What is the rainiest month in Ajo?
August, with 1.7 inches of rain and melted snow. The year totals 7 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Ajo itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Ajo, AZ (2 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.