Fort Ann, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.1 °C (low) to 14.4 °C (high). Annual precipitation averages 1034 Millimeters. Fort Ann is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.3 °C | -0.9 °C | 68.58 mm |
| February | -10.9 °C | 1.1 °C | 57.15 mm |
| March | -4.9 °C | 6 °C | 72.14 mm |
| April | 2.1 °C | 14.3 °C | 83.82 mm |
| May | 8.3 °C | 21.2 °C | 84.84 mm |
| June | 13.5 °C | 25.8 °C | 106.93 mm |
| July | 16.2 °C | 28.4 °C | 107.7 mm |
| August | 15.3 °C | 27.3 °C | 99.06 mm |
| September | 10.9 °C | 23.2 °C | 85.6 mm |
| October | 4.6 °C | 15.8 °C | 102.36 mm |
| November | -1.1 °C | 8.6 °C | 81.53 mm |
| December | -6.1 °C | 2.2 °C | 84.33 mm |
| Annual | 3.1 °C | 14.4 °C | 1034.04 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |