| 2023 Hardiness Zone: | Zone 9b: 25°F to 30°F Zone 10a: 30°F to 35°F | |
| 2012 Hardiness Zone: | 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. 1 - Mar. 10 | |
| 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 92373 - Redlands, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 40 | 42 | 43 | 47 | 51 | 56 | 61 | 62 | 59 | 52 | 44 | 39 | 50 |
| Avg Max Temp (°F) | 65 | 67 | 68 | 74 | 80 | 88 | 95 | 95 | 90 | 82 | 72 | 66 | 79 |
| Avg Precip (In.) | 3.01 | 3.04 | 2.62 | .8 | .43 | .13 | .1 | .22 | .41 | .49 | .91 | 1.53 | 13.68 |