Au Sable Forks, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.2 °F (low) to 54.9 °F (high). Annual precipitation averages 35.5 Inches. Au Sable Forks 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 | 8.8 °F | 27.2 °F | 2.09 in. |
| February | 10.7 °F | 30.3 °F | 1.82 in. |
| March | 20.2 °F | 39.1 °F | 2.38 in. |
| April | 33.0 °F | 53.5 °F | 2.81 in. |
| May | 44.8 °F | 67.0 °F | 3.14 in. |
| June | 54.2 °F | 75.6 °F | 4.34 in. |
| July | 59.1 °F | 80.4 °F | 3.65 in. |
| August | 57.3 °F | 78.7 °F | 3.44 in. |
| September | 49.6 °F | 71.5 °F | 3.02 in. |
| October | 38.7 °F | 57.7 °F | 3.71 in. |
| November | 28.6 °F | 44.8 °F | 2.69 in. |
| December | 17.5 °F | 33.4 °F | 2.4 in. |
| Annual | 35.2 °F | 54.9 °F | 35.49 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |