| 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 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: | Jun. 1 - Jun. 10 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 60a - Glaciated Low Plateau |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 13846 - Treadwell, NY | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 11 | 12 | 21 | 31 | 41 | 50 | 54 | 53 | 46 | 35 | 28 | 18 | 33 |
| Avg Max Temp (°F) | 30 | 33 | 42 | 54 | 67 | 75 | 79 | 77 | 69 | 59 | 46 | 35 | 56 |
| Avg Precip (In.) | 2.95 | 2.4 | 3.34 | 3.73 | 4.22 | 4.33 | 4.09 | 3.81 | 4.09 | 3.69 | 3.8 | 3.17 | 43.63 |