| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 82g - Downeast Coast |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 04681 - Stonington, ME | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 13 | 14 | 25 | 33 | 43 | 52 | 57 | 57 | 49 | 40 | 31 | 20 | 36 |
| Avg Max Temp (°F) | 31 | 33 | 42 | 53 | 64 | 73 | 78 | 77 | 69 | 58 | 47 | 36 | 55 |
| Avg Precip (In.) | 4.82 | 3.76 | 4.54 | 4.2 | 3.83 | 3.63 | 3.3 | 2.76 | 4.11 | 4.23 | 5.01 | 4.52 | 48.71 |