| 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 4a: -30F to -25F |
| 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: | 58ac - Eastern Adirondack Foothills |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 12817 - Chestertown, NY | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 7 | 9 | 20 | 32 | 43 | 52 | 57 | 55 | 47 | 36 | 28 | 16 | 34 |
| Avg Max Temp (°F) | 29 | 32 | 42 | 54 | 68 | 76 | 80 | 78 | 69 | 58 | 45 | 33 | 55 |
| Avg Precip (In.) | 3.37 | 2.56 | 3.39 | 3.53 | 3.91 | 3.69 | 3.75 | 3.84 | 3.9 | 3.68 | 3.95 | 3.06 | 42.62 |