| 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 92833 - Fullerton, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 45 | 47 | 48 | 50 | 55 | 59 | 62 | 63 | 61 | 56 | 49 | 44 | 53 |
| Avg Max Temp (°F) | 68 | 69 | 69 | 73 | 75 | 79 | 84 | 86 | 84 | 79 | 73 | 69 | 76 |
| Avg Precip (In.) | 3.09 | 3.15 | 2.55 | .79 | .27 | .09 | .02 | .1 | .25 | .37 | 1.17 | 1.77 | 13.61 |