| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°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 04693 - Winter Harbor, ME | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 13 | 16 | 25 | 34 | 43 | 51 | 57 | 56 | 49 | 41 | 32 | 20 | 36 |
| Avg Max Temp (°F) | 30 | 32 | 41 | 52 | 64 | 72 | 77 | 76 | 67 | 57 | 46 | 36 | 54 |
| Avg Precip (In.) | 5.53 | 4.13 | 4.61 | 4.24 | 3.81 | 3.61 | 3.17 | 2.73 | 4.23 | 4.6 | 5.42 | 5.02 | 51.09 |