| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F |
| 2012 Hardiness Zone: | Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F |
| Average First Frost Date: | Sep. 21 - Sep. 30 |
| Average Last Frost Date: | May 21 - May 31 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 82e - Central Maine Embayment |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 04961 - New Portland, ME | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 3 | 5 | 16 | 29 | 40 | 50 | 55 | 53 | 44 | 34 | 26 | 12 | 31 |
| Avg Max Temp (°F) | 25 | 29 | 38 | 50 | 64 | 73 | 78 | 76 | 67 | 56 | 43 | 31 | 53 |
| Avg Precip (In.) | 3.21 | 2.32 | 3.3 | 3.43 | 3.65 | 3.92 | 3.59 | 3.5 | 3.51 | 3.63 | 3.8 | 3.34 | 41.19 |