| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F |
| Average First Frost Date: | Sep. 21 - Sep. 30 |
| Average Last Frost Date: | Jun. 1 - Jun. 10 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 58s - Western Maine Foothills |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 04294 - Wilton, ME | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 4 | 6 | 17 | 29 | 40 | 49 | 54 | 53 | 44 | 34 | 25 | 12 | 31 |
| Avg Max Temp (°F) | 24 | 28 | 37 | 49 | 63 | 72 | 77 | 75 | 66 | 54 | 41 | 29 | 51 |
| Avg Precip (In.) | 4.24 | 3.1 | 4.52 | 4.54 | 4.59 | 5.21 | 3.85 | 4.45 | 4.14 | 4.87 | 4.91 | 4.42 | 52.84 |