Mountain Dale, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.4 °C (low) to 14.5 °C (high). Annual precipitation averages 1283.7 Millimeters. Mountain Dale 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9 °C | 0.4 °C | 87.88 mm |
| February | -8.4 °C | 2.1 °C | 69.85 mm |
| March | -4 °C | 6.8 °C | 96.77 mm |
| April | 1.9 °C | 14.2 °C | 98.3 mm |
| May | 7.8 °C | 20.4 °C | 103.12 mm |
| June | 13 °C | 25 °C | 128.02 mm |
| July | 15.4 °C | 27.7 °C | 123.7 mm |
| August | 14.7 °C | 26.6 °C | 116.59 mm |
| September | 10.7 °C | 22.6 °C | 131.32 mm |
| October | 4.4 °C | 15.7 °C | 124.21 mm |
| November | -0.8 °C | 9.2 °C | 94.49 mm |
| December | -5.5 °C | 3.1 °C | 109.47 mm |
| Annual | 3.4 °C | 14.5 °C | 1283.72 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |