| 2023 Hardiness Zone: | Zone 10a: 30°F to 35°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: | Frost Rare |
| Average Last Frost Date: | Jan. 21 - Jan. 31 |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate |
| Ecoregion: | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 94066 - San Bruno, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 44 | 46 | 47 | 48 | 50 | 52 | 54 | 55 | 55 | 52 | 48 | 44 | 49 |
| Avg Max Temp (°F) | 57 | 60 | 62 | 65 | 67 | 70 | 71 | 72 | 73 | 71 | 63 | 57 | 66 |
| Avg Precip (In.) | 4.65 | 4.08 | 3.37 | 1.22 | .44 | .13 | .03 | .08 | .23 | 1.15 | 2.93 | 3.05 | 21.36 |