| 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 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: | 83b - Champlain Lowlands |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 12996 - Willsboro, NY | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 8 | 10 | 21 | 34 | 46 | 55 | 60 | 58 | 50 | 39 | 30 | 17 | 36 |
| Avg Max Temp (°F) | 27 | 30 | 40 | 54 | 68 | 76 | 81 | 78 | 69 | 57 | 45 | 33 | 55 |
| Avg Precip (In.) | 2.05 | 1.59 | 2.3 | 2.7 | 3.07 | 3.34 | 3.6 | 3.79 | 3.55 | 2.9 | 2.9 | 2.09 | 33.89 |