| 2023 Hardiness Zone: | 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: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 91108 - San Marino, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 44 | 45 | 47 | 50 | 54 | 58 | 62 | 63 | 61 | 55 | 47 | 43 | 52 |
| Avg Max Temp (°F) | 68 | 70 | 71 | 76 | 78 | 84 | 89 | 90 | 87 | 82 | 74 | 69 | 78 |
| Avg Precip (In.) | 4.15 | 4.6 | 3.89 | 1.04 | .41 | .15 | .03 | .15 | .42 | .58 | 1.32 | 2.23 | 18.98 |