| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F |
| 2012 Hardiness Zone: | Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F |
| 1990 Hardiness Zone: | Zone 4a: -30F to -25F |
| 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: | 58f - Vermont Piedmont |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 05086 - West Topsham, VT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 2 | 4 | 16 | 28 | 39 | 47 | 52 | 51 | 43 | 32 | 24 | 11 | 29 |
| Avg Max Temp (°F) | 26 | 30 | 39 | 51 | 65 | 73 | 78 | 75 | 67 | 55 | 43 | 31 | 53 |
| Avg Precip (In.) | 3.18 | 2.39 | 3.26 | 3.29 | 3.81 | 4.56 | 4.2 | 4.34 | 3.72 | 3.7 | 3.67 | 3.38 | 43.53 |