| 2023 Hardiness Zone: | Zone 9a: 20°F to 25°F Zone 9b: 25°F to 30°F Zone 10a: 30°F to 35°F |
| 2012 Hardiness Zone: | Zone 9a: 20°F to 25°F Zone 9b: 25°F to 30°F Zone 10a: 30°F to 35°F |
| 1990 Hardiness Zone: | Zone 9b: 25F to 30F |
| Average First Frost Date: | Nov. 21 - Nov. 30 |
| Average Last Frost Date: | Mar. 1 - Mar. 10 |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate |
| Ecoregion: | |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 95442 - Glen Ellen, CA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 38 | 39 | 41 | 43 | 47 | 51 | 53 | 53 | 52 | 48 | 41 | 37 | 45 |
| Avg Max Temp (°F) | 56 | 59 | 63 | 69 | 76 | 83 | 88 | 87 | 84 | 76 | 63 | 56 | 72 |
| Avg Precip (In.) | 7.76 | 7.48 | 5.49 | 1.93 | .87 | .17 | .05 | .1 | .42 | 1.91 | 5.08 | 5.48 | 36.73 |