| 2023 Hardiness Zone: | 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 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 92346 - Highland, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 40 | 42 | 43 | 46 | 51 | 56 | 61 | 62 | 59 | 52 | 44 | 40 | 50 |
| Avg Max Temp (°F) | 64 | 66 | 68 | 74 | 79 | 87 | 95 | 95 | 90 | 81 | 71 | 65 | 78 |
| Avg Precip (In.) | 3.3 | 3.46 | 3.08 | .89 | .44 | .11 | .06 | .21 | .39 | .63 | 1.11 | 1.8 | 15.49 |