| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°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 06359 - North Stonington, CT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 19 | 21 | 28 | 37 | 46 | 55 | 62 | 61 | 53 | 42 | 34 | 25 | 40 |
| Avg Max Temp (°F) | 37 | 39 | 48 | 57 | 68 | 76 | 82 | 80 | 73 | 63 | 52 | 42 | 60 |
| Avg Precip (In.) | 4.64 | 3.7 | 4.76 | 4.5 | 4.04 | 3.66 | 3.61 | 4.3 | 4.14 | 4.23 | 4.8 | 4.56 | 50.95 |