| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| 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 04239 - Jay, ME | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 5 | 8 | 19 | 31 | 41 | 51 | 56 | 54 | 45 | 35 | 27 | 13 | 32 |
| Avg Max Temp (°F) | 27 | 31 | 40 | 52 | 66 | 74 | 79 | 77 | 69 | 57 | 44 | 32 | 54 |
| Avg Precip (In.) | 3.58 | 2.64 | 3.79 | 3.84 | 3.88 | 4.19 | 3.64 | 3.81 | 3.71 | 3.96 | 4.09 | 3.73 | 44.86 |