| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 11 - May 20 |
| 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 04605 - Ellsworth, ME | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 10 | 13 | 23 | 33 | 43 | 51 | 57 | 57 | 49 | 39 | 30 | 17 | 35 |
| Avg Max Temp (°F) | 30 | 33 | 41 | 53 | 65 | 73 | 79 | 77 | 68 | 57 | 46 | 35 | 55 |
| Avg Precip (In.) | 4.29 | 3.17 | 4.22 | 4.19 | 3.85 | 3.64 | 3.43 | 2.94 | 4.02 | 4.16 | 4.7 | 4.16 | 46.78 |