| 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: | Sep. 21 - Sep. 30 |
| Average Last Frost Date: | Jun. 1 - Jun. 10 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 58c - Green Mountains/Berkshire Highlands |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 05155 - South Londonderry, VT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 5 | 6 | 17 | 29 | 40 | 48 | 52 | 51 | 42 | 31 | 24 | 13 | 30 |
| Avg Max Temp (°F) | 28 | 31 | 40 | 52 | 65 | 73 | 78 | 76 | 67 | 56 | 43 | 32 | 53 |
| Avg Precip (In.) | 3.76 | 3.03 | 3.87 | 3.76 | 4.12 | 3.97 | 4.15 | 4.43 | 3.86 | 4 | 3.92 | 3.65 | 46.52 |