| 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 |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| 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: | 82f - Midcoast |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 04860 - Tenants Harbor, ME | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 13 | 15 | 25 | 34 | 43 | 52 | 58 | 57 | 50 | 39 | 31 | 20 | 36 |
| Avg Max Temp (°F) | 32 | 34 | 42 | 53 | 64 | 73 | 78 | 77 | 69 | 58 | 47 | 36 | 55 |
| Avg Precip (In.) | 4.48 | 3.72 | 4.48 | 4.17 | 3.92 | 3.59 | 3.4 | 2.77 | 4.05 | 4.08 | 5.04 | 4.37 | 48.06 |