| 2023 Hardiness Zone: | Zone 9a: 20°F to 25°F Zone 9b: 25°F to 30°F |
| 2012 Hardiness Zone: | Zone 9a: 20°F to 25°F Zone 9b: 25°F to 30°F |
| 1990 Hardiness Zone: | Zone 9a: 20F to 25F |
| Average First Frost Date: | Nov. 11 - Nov. 20 |
| Average Last Frost Date: | Apr. 1 - Apr. 10 |
| Koppen-Geiger Climate Zone: | Csa - Hot-Summer Mediterranean Climate |
| Ecoregion: | |
| Heat Zone Days: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 95946 - Penn Valley, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 35 | 37 | 40 | 43 | 49 | 54 | 58 | 57 | 54 | 47 | 39 | 34 | 46 |
| Avg Max Temp (°F) | 55 | 58 | 62 | 68 | 77 | 85 | 92 | 92 | 86 | 76 | 62 | 55 | 72 |
| Avg Precip (In.) | 7.45 | 7.07 | 6.68 | 2.9 | 1.53 | .46 | .12 | .16 | .87 | 2.28 | 5.62 | 6.03 | 41.17 |