Fair Haven, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.7 °C (low) to 13.7 °C (high). Annual precipitation averages 1068.1 Millimeters. Fair Haven is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.8 °C | 0.2 °C | 88.39 mm |
| February | -7.3 °C | 1.1 °C | 68.07 mm |
| March | -3.5 °C | 5.4 °C | 75.18 mm |
| April | 2.4 °C | 12.1 °C | 86.61 mm |
| May | 8.3 °C | 19.1 °C | 84.07 mm |
| June | 13.8 °C | 23.8 °C | 89.92 mm |
| July | 17.3 °C | 26.6 °C | 90.42 mm |
| August | 16.6 °C | 26.1 °C | 96.01 mm |
| September | 12.7 °C | 22.5 °C | 92.2 mm |
| October | 6.7 °C | 15.4 °C | 108.2 mm |
| November | 1.4 °C | 9.2 °C | 96.27 mm |
| December | -3.9 °C | 3.1 °C | 92.71 mm |
| Annual | 4.7 °C | 13.7 °C | 1068.05 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |