| 2023 Hardiness Zone: | Zone 10a: 30°F to 35°F |
| 2012 Hardiness Zone: | Zone 10a: 30°F to 35°F |
| 1990 Hardiness Zone: | Zone 9b: 25F to 30F |
| Average First Frost Date: | Jan. 21 - Jan. 31 |
| 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 94089 - Sunnyvale, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 40 | 44 | 45 | 47 | 51 | 54 | 56 | 57 | 55 | 51 | 45 | 40 | 49 |
| Avg Max Temp (°F) | 59 | 63 | 66 | 70 | 75 | 79 | 82 | 82 | 80 | 75 | 65 | 58 | 71 |
| Avg Precip (In.) | 3.3 | 3.08 | 2.73 | 1.01 | .41 | .12 | .04 | .07 | .23 | .92 | 1.91 | 2.24 | 16.06 |