| 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: | Jan. 21 - Jan. 31 | |
| Average Last Frost Date: | No Frost | |
| Koppen-Geiger Climate Zone: | Csa - Hot-Summer Mediterranean Climate | |
| Ecoregion: | ||
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 91731 - El Monte, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 43 | 45 | 47 | 50 | 55 | 58 | 62 | 63 | 61 | 55 | 47 | 43 | 52 |
| Avg Max Temp (°F) | 69 | 70 | 71 | 76 | 77 | 82 | 87 | 88 | 87 | 82 | 75 | 70 | 78 |
| Avg Precip (In.) | 3.78 | 4.26 | 3.41 | .84 | .31 | .08 | .03 | .11 | .38 | .48 | 1.2 | 1.97 | 16.84 |