| 2023 Hardiness Zone: | Zone 9b: 25°F to 30°F | |
| 2012 Hardiness Zone: | Zone 9a: 20°F to 25°F Zone 9b: 25°F to 30°F | |
| 1990 Hardiness Zone: | Zone 9b: 25F to 30F | |
| Average First Frost Date: | Nov. 21 - Nov. 30 | |
| Average Last Frost Date: | Mar. 11 - Mar. 20 | |
| Koppen-Geiger Climate Zone: | Csa - Hot-Summer Mediterranean Climate | |
| Ecoregion: | ||
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 91 - 120 days Over 86°F |
Annual Climate Data for ZIP Code 92320 - Calimesa, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 38 | 39 | 40 | 42 | 47 | 53 | 59 | 60 | 56 | 49 | 42 | 37 | 47 |
| Avg Max Temp (°F) | 62 | 64 | 67 | 72 | 79 | 87 | 96 | 96 | 90 | 80 | 70 | 63 | 77 |
| Avg Precip (In.) | 3.89 | 3.83 | 3.81 | 1.09 | .66 | .19 | .25 | .22 | .56 | .69 | 1.36 | 1.98 | 18.53 |