| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| Average First Frost Date: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 82h - Penobscot Lowlands |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 04401 - Bangor, ME | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 7 | 11 | 22 | 33 | 43 | 52 | 58 | 56 | 48 | 37 | 29 | 15 | 34 |
| Avg Max Temp (°F) | 27 | 31 | 40 | 52 | 65 | 74 | 79 | 78 | 69 | 57 | 44 | 33 | 54 |
| Avg Precip (In.) | 3.43 | 2.59 | 3.45 | 3.34 | 3.42 | 3.44 | 3.26 | 3.06 | 3.5 | 3.49 | 3.77 | 3.44 | 40.2 |