Alexander, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.2 °F (low) to 56.7 °F (high). Annual precipitation averages 38.8 Inches. Alexander is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 16.0 °F | 31.7 °F | 2.74 in. |
| February | 16.9 °F | 33.4 °F | 2.09 in. |
| March | 23.6 °F | 41.7 °F | 2.65 in. |
| April | 34.6 °F | 55.0 °F | 3.1 in. |
| May | 46.2 °F | 67.7 °F | 3.29 in. |
| June | 55.5 °F | 76.0 °F | 3.89 in. |
| July | 60.0 °F | 79.7 °F | 3.69 in. |
| August | 58.3 °F | 78.8 °F | 3.61 in. |
| September | 51.3 °F | 72.2 °F | 3.63 in. |
| October | 41.1 °F | 59.6 °F | 4.03 in. |
| November | 31.6 °F | 47.3 °F | 3.22 in. |
| December | 22.9 °F | 36.8 °F | 2.84 in. |
| Annual | 38.2 °F | 56.7 °F | 38.78 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |