| 2023 Hardiness Zone: | Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F |
| 2012 Hardiness Zone: | Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F |
| 1990 Hardiness Zone: | Zone 3b: -35F to -30F |
| 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: | 83d - St. Lawrence Lowlands |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 13642 - Gouverneur, NY | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 5 | 6 | 18 | 32 | 43 | 52 | 57 | 54 | 46 | 36 | 27 | 13 | 32 |
| Avg Max Temp (°F) | 26 | 29 | 40 | 53 | 66 | 75 | 80 | 78 | 69 | 57 | 44 | 32 | 54 |
| Avg Precip (In.) | 2.59 | 2.08 | 2.56 | 3.11 | 3.17 | 3.23 | 3.24 | 3.81 | 4.2 | 3.34 | 3.66 | 2.94 | 37.94 |