| 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 12901 - Plattsburgh, NY | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 8 | 9 | 21 | 34 | 45 | 55 | 60 | 58 | 49 | 38 | 29 | 16 | 35 |
| Avg Max Temp (°F) | 27 | 29 | 40 | 53 | 67 | 76 | 80 | 77 | 68 | 57 | 44 | 32 | 54 |
| Avg Precip (In.) | 2.23 | 1.71 | 2.22 | 2.9 | 3.01 | 3.34 | 3.3 | 3.81 | 3.44 | 2.85 | 2.93 | 2.34 | 34.08 |