| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F | |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F | |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F | |
| Average First Frost Date: | Oct. 11 - Oct. 20 | |
| Average Last Frost Date: | May 1 - May 10 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 59c - Southern New England Coastal Plains and Hills | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 06384 - Voluntown, CT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 17 | 19 | 27 | 36 | 46 | 55 | 61 | 60 | 52 | 40 | 32 | 23 | 39 |
| Avg Max Temp (°F) | 37 | 39 | 47 | 58 | 69 | 77 | 82 | 80 | 73 | 62 | 52 | 41 | 60 |
| Avg Precip (In.) | 4.74 | 3.79 | 4.87 | 4.61 | 4.16 | 3.77 | 4.07 | 4.49 | 4.26 | 4.47 | 4.89 | 4.68 | 52.8 |