| 2023 Hardiness Zone: | Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 1 - May 10 |
| 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 04355 - Readfield, ME | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 8 | 10 | 21 | 32 | 43 | 52 | 58 | 56 | 48 | 37 | 28 | 15 | 34 |
| Avg Max Temp (°F) | 28 | 32 | 41 | 52 | 66 | 75 | 80 | 78 | 70 | 58 | 45 | 33 | 55 |
| Avg Precip (In.) | 3.55 | 2.7 | 3.91 | 3.95 | 3.96 | 3.81 | 3.54 | 3.37 | 3.71 | 4.17 | 4.11 | 3.71 | 44.49 |