| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°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 4a: -30F to -25F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 58af - Tug Hill Transition |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 13493 - Williamstown, NY | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 9 | 9 | 20 | 32 | 42 | 51 | 55 | 55 | 47 | 37 | 29 | 17 | 33 |
| Avg Max Temp (°F) | 28 | 31 | 40 | 53 | 67 | 75 | 80 | 78 | 70 | 58 | 45 | 33 | 55 |
| Avg Precip (In.) | 4.54 | 3.24 | 3.84 | 3.94 | 4.02 | 4.24 | 4.21 | 4.27 | 5.02 | 4.21 | 4.87 | 4.45 | 50.86 |