| 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 5a: -20F to -15F |
| Average First Frost Date: | Sep. 21 - Sep. 30 |
| 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 12093 - Jefferson, NY | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 11 | 12 | 21 | 31 | 42 | 50 | 55 | 53 | 46 | 35 | 28 | 18 | 33 |
| Avg Max Temp (°F) | 29 | 32 | 41 | 53 | 66 | 74 | 78 | 76 | 68 | 57 | 44 | 34 | 54 |
| Avg Precip (In.) | 2.86 | 2.29 | 3.16 | 3.55 | 4.2 | 3.99 | 4.03 | 3.77 | 3.88 | 3.52 | 3.65 | 2.88 | 41.79 |