| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F 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 04938 - Farmington, ME | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 3 | 6 | 17 | 29 | 38 | 48 | 53 | 51 | 42 | 33 | 25 | 11 | 30 |
| Avg Max Temp (°F) | 26 | 30 | 39 | 51 | 65 | 73 | 78 | 77 | 68 | 56 | 43 | 31 | 53 |
| Avg Precip (In.) | 3.69 | 2.77 | 3.95 | 4.03 | 3.94 | 4.43 | 3.65 | 3.94 | 3.76 | 4.06 | 4.17 | 3.89 | 46.3 |