| 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: | 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: | 91 - 120 days Over 86°F |
Annual Climate Data for ZIP Code 90640 - Montebello, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 46 | 48 | 50 | 52 | 56 | 60 | 63 | 64 | 63 | 57 | 50 | 45 | 55 |
| Avg Max Temp (°F) | 68 | 69 | 70 | 74 | 75 | 80 | 84 | 85 | 84 | 80 | 73 | 69 | 76 |
| Avg Precip (In.) | 3.3 | 3.73 | 2.96 | .75 | .28 | .08 | .02 | .11 | .31 | .44 | 1.16 | 1.87 | 15.01 |