| 2023 Hardiness Zone: | Zone 10a: 30°F to 35°F | |
| 2012 Hardiness Zone: | Zone 9b: 25°F to 30°F Zone 10a: 30°F to 35°F | |
| 1990 Hardiness Zone: | Zone 9b: 25F to 30F | |
| Average First Frost Date: | Nov. 21 - Nov. 30 | |
| Average Last Frost Date: | Feb. 21 - Feb. 29 | |
| 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 92405 - San Bernardino, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 40 | 41 | 43 | 46 | 50 | 56 | 61 | 62 | 59 | 51 | 43 | 39 | 49 |
| Avg Max Temp (°F) | 63 | 65 | 68 | 73 | 79 | 87 | 94 | 94 | 89 | 80 | 70 | 64 | 77 |
| Avg Precip (In.) | 3.46 | 3.6 | 3.24 | .88 | .45 | .12 | .04 | .21 | .42 | .73 | 1.18 | 1.87 | 16.19 |