| 2023 Hardiness Zone: | Zone 9b: 25°F to 30°F |
| 2012 Hardiness Zone: | Zone 9b: 25°F to 30°F |
| 1990 Hardiness Zone: | Zone 9a: 20F to 25F |
| Average First Frost Date: | Nov. 21 - Nov. 30 |
| Average Last Frost Date: | Mar. 11 - Mar. 20 |
| Koppen-Geiger Climate Zone: | Csa - Hot-Summer Mediterranean Climate |
| Ecoregion: | |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 95663 - Penryn, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 36 | 39 | 41 | 43 | 50 | 55 | 59 | 58 | 55 | 48 | 41 | 36 | 47 |
| Avg Max Temp (°F) | 54 | 60 | 64 | 70 | 80 | 88 | 95 | 94 | 89 | 78 | 63 | 54 | 74 |
| Avg Precip (In.) | 4.87 | 4.57 | 4.35 | 1.8 | .8 | .28 | .11 | .1 | .53 | 1.4 | 3.45 | 3.69 | 25.94 |