| 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 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 58k - Green Mountain Foothills |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 05495 - Williston, VT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 8 | 9 | 20 | 32 | 44 | 53 | 58 | 57 | 48 | 37 | 29 | 16 | 34 |
| Avg Max Temp (°F) | 27 | 29 | 39 | 52 | 67 | 75 | 80 | 78 | 68 | 56 | 43 | 32 | 54 |
| Avg Precip (In.) | 2.54 | 1.85 | 2.65 | 3.16 | 3.55 | 3.9 | 4.27 | 4.44 | 4.06 | 3.48 | 3.42 | 2.55 | 39.87 |