Kiamesha Lake, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.5 °C (low) to 13.3 °C (high). Annual precipitation averages 1275.8 Millimeters. Kiamesha 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 | -9.9 °C | -0.6 °C | 89.66 mm |
| February | -9.4 °C | 1.1 °C | 68.83 mm |
| March | -5 °C | 5.7 °C | 95.76 mm |
| April | 1.1 °C | 12.8 °C | 100.08 mm |
| May | 6.9 °C | 19.2 °C | 106.68 mm |
| June | 12.2 °C | 23.6 °C | 128.27 mm |
| July | 14.6 °C | 26.4 °C | 123.95 mm |
| August | 13.8 °C | 25.3 °C | 116.59 mm |
| September | 9.9 °C | 21.4 °C | 123.95 mm |
| October | 3.7 °C | 14.7 °C | 121.67 mm |
| November | -1.7 °C | 8.2 °C | 91.69 mm |
| December | -6.3 °C | 2.1 °C | 108.71 mm |
| Annual | 2.5 °C | 13.3 °C | 1275.84 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 |