| 2023 Hardiness Zone: | Zone 9a: 20°F to 25°F Zone 9b: 25°F to 30°F Zone 10a: 30°F to 35°F | |
| 2012 Hardiness Zone: | Zone 9a: 20°F to 25°F Zone 9b: 25°F to 30°F Zone 10a: 30°F to 35°F | |
| 1990 Hardiness Zone: | Zone 10a: 30F to 35F | |
| Average First Frost Date: | Jan. 21 - Jan. 31 | |
| Average Last Frost Date: | Jan. 21 - Jan. 31 | |
| Koppen-Geiger Climate Zone: | BWh - Hot Desert Climate | |
| Ecoregion: | ||
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 151 - 180 days Over 86°F |
Annual Climate Data for ZIP Code 85321 - Ajo, AZ | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 44 | 47 | 50 | 56 | 64 | 73 | 78 | 76 | 72 | 63 | 52 | 44 | 60 |
| Avg Max Temp (°F) | 65 | 70 | 74 | 82 | 90 | 100 | 102 | 101 | 97 | 87 | 74 | 65 | 84 |
| Avg Precip (In.) | .67 | .68 | .78 | .23 | .15 | .05 | .81 | 1.66 | .85 | .66 | .52 | .9 | 7.97 |