| 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 5b: -15°F to -10°F | |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F | |
| Average First Frost Date: | Oct. 1 - Oct. 10 | |
| 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 | |
| Current Drought Status: | Moderate Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 04987 - Troy, ME | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 4 | 7 | 19 | 31 | 41 | 51 | 56 | 54 | 46 | 35 | 27 | 13 | 32 |
| Avg Max Temp (°F) | 27 | 31 | 40 | 52 | 65 | 74 | 79 | 77 | 69 | 57 | 44 | 32 | 54 |
| Avg Precip (In.) | 3.51 | 2.63 | 3.72 | 3.7 | 3.77 | 3.9 | 3.56 | 3.62 | 3.79 | 3.95 | 4.07 | 3.48 | 43.71 |