| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F | |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F | |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F | |
| Average First Frost Date: | Oct. 1 - Oct. 10 | |
| Average Last Frost Date: | May 21 - May 31 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 58a - Taconic Mountains | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 05735 - Castleton, VT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 10 | 11 | 22 | 33 | 44 | 53 | 57 | 55 | 48 | 37 | 29 | 17 | 35 |
| Avg Max Temp (°F) | 30 | 33 | 43 | 56 | 70 | 77 | 82 | 79 | 71 | 59 | 46 | 35 | 57 |
| Avg Precip (In.) | 2.66 | 1.98 | 2.59 | 2.82 | 3.68 | 3.77 | 4.33 | 4.36 | 3.95 | 3.27 | 3.21 | 2.71 | 39.34 |