Swan Lake, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.4 °C (low) to 13.5 °C (high). Annual precipitation averages 1266.4 Millimeters. Swan Lake 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. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.1 °C | -0.6 °C | 89.41 mm |
| February | -9.5 °C | 1.1 °C | 66.55 mm |
| March | -5.1 °C | 5.8 °C | 90.42 mm |
| April | 0.9 °C | 13 °C | 102.11 mm |
| May | 6.8 °C | 19.3 °C | 109.73 mm |
| June | 11.9 °C | 23.8 °C | 134.37 mm |
| July | 14.4 °C | 26.6 °C | 125.73 mm |
| August | 13.7 °C | 25.4 °C | 116.84 mm |
| September | 9.7 °C | 21.7 °C | 120.65 mm |
| October | 3.6 °C | 15 °C | 117.09 mm |
| November | -1.7 °C | 8.3 °C | 87.88 mm |
| December | -6.3 °C | 2.2 °C | 105.66 mm |
| Annual | 2.4 °C | 13.5 °C | 1266.44 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |