| 2023 Hardiness Zone: | Zone 9b: 25°F to 30°F |
| 2012 Hardiness Zone: | Zone 9b: 25°F to 30°F |
| 1990 Hardiness Zone: | Zone 9b: 25F to 30F |
| Average First Frost Date: | Dec. 21 - Dec. 31 |
| Average Last Frost Date: | Feb. 11 - Feb. 20 |
| Koppen-Geiger Climate Zone: | Csa - Hot-Summer Mediterranean Climate |
| Ecoregion: | |
| Heat Zone Days: | 91 - 120 days Over 86°F |
Annual Climate Data for ZIP Code 95638 - Herald, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 38 | 41 | 44 | 46 | 51 | 56 | 59 | 58 | 56 | 50 | 43 | 37 | 48 |
| Avg Max Temp (°F) | 54 | 61 | 66 | 73 | 80 | 87 | 92 | 91 | 88 | 78 | 64 | 55 | 74 |
| Avg Precip (In.) | 3.82 | 3.49 | 3.27 | 1.5 | .58 | .19 | .07 | .06 | .35 | .99 | 2.48 | 2.7 | 19.5 |