| 2023 Hardiness Zone: | Zone 10b: 35°F to 40°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: | Jan. 21 - Jan. 31 | |
| Average Last Frost Date: | Jan. 21 - Jan. 31 | |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate | |
| Ecoregion: | ||
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 92603 - Irvine, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 44 | 46 | 47 | 50 | 54 | 58 | 61 | 62 | 60 | 55 | 48 | 44 | 52 |
| Avg Max Temp (°F) | 67 | 68 | 69 | 72 | 74 | 78 | 82 | 83 | 82 | 78 | 73 | 68 | 75 |
| Avg Precip (In.) | 3.18 | 3.29 | 2.99 | .82 | .27 | .11 | .04 | .12 | .42 | .42 | 1.22 | 1.85 | 14.71 |