| 2023 Hardiness Zone: | Zone 10b: 35°F to 40°F Zone 10a: 30°F to 35°F | |
| 2012 Hardiness Zone: | 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 92821 - Brea, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 43 | 45 | 46 | 48 | 53 | 56 | 60 | 61 | 59 | 54 | 47 | 43 | 51 |
| Avg Max Temp (°F) | 68 | 69 | 70 | 75 | 77 | 82 | 88 | 89 | 87 | 81 | 74 | 69 | 77 |
| Avg Precip (In.) | 3.6 | 2.95 | 2.27 | 1.01 | .29 | .09 | .02 | .07 | .15 | .32 | 1.12 | 1.87 | 13.77 |