| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F 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 1 - May 10 |
| 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 05489 - Underhill, VT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 6 | 8 | 19 | 31 | 43 | 52 | 57 | 55 | 47 | 36 | 27 | 14 | 33 |
| Avg Max Temp (°F) | 25 | 28 | 38 | 51 | 66 | 74 | 79 | 76 | 67 | 55 | 42 | 30 | 53 |
| Avg Precip (In.) | 2.76 | 2.09 | 3.01 | 3.64 | 4 | 4.34 | 4.74 | 5.04 | 4.47 | 3.94 | 4.02 | 2.92 | 44.98 |