| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°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: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | May 21 - May 31 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 83f - Mohawk Valley |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 12009 - Altamont, NY | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 12 | 14 | 24 | 34 | 45 | 54 | 59 | 57 | 49 | 38 | 30 | 19 | 36 |
| Avg Max Temp (°F) | 31 | 33 | 43 | 56 | 68 | 76 | 81 | 79 | 71 | 59 | 47 | 35 | 57 |
| Avg Precip (In.) | 2.88 | 2.33 | 3.3 | 3.49 | 3.9 | 3.97 | 3.67 | 3.73 | 3.56 | 3.32 | 3.47 | 2.93 | 40.55 |