| 2023 Hardiness Zone: | Zone 10b: 35°F to 40°F Zone 10a: 30°F to 35°F | |
| 2012 Hardiness Zone: | Zone 10b: 35°F to 40°F Zone 10a: 30°F to 35°F | |
| 1990 Hardiness Zone: | Zone 10a: 30F to 35F | |
| Average First Frost Date: | No Frost | |
| Average Last Frost Date: | No Frost | |
| Koppen-Geiger Climate Zone: | Csa - Hot-Summer Mediterranean Climate | |
| Ecoregion: | ||
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 92835 - Fullerton, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 44 | 45 | 47 | 49 | 54 | 57 | 61 | 62 | 60 | 55 | 47 | 43 | 52 |
| Avg Max Temp (°F) | 68 | 69 | 70 | 74 | 76 | 82 | 87 | 88 | 86 | 81 | 74 | 69 | 77 |
| Avg Precip (In.) | 3.46 | 3.14 | 2.48 | .89 | .3 | .09 | .02 | .1 | .25 | .37 | 1.17 | 1.86 | 14.13 |