Milton, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.3 °C (low) to 14.4 °C (high). Annual precipitation averages 1174.2 Millimeters. Milton is located in USDA Plant Hardiness Zone 5b. 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 | 85.85 mm |
| February | -9.3 °C | 1.1 °C | 67.06 mm |
| March | -4.5 °C | 6.1 °C | 89.41 mm |
| April | 1.9 °C | 14.3 °C | 94.74 mm |
| May | 8.3 °C | 21.1 °C | 96.01 mm |
| June | 13.4 °C | 25.5 °C | 118.87 mm |
| July | 16 °C | 28 °C | 123.95 mm |
| August | 15.2 °C | 26.9 °C | 102.87 mm |
| September | 10.9 °C | 23.1 °C | 99.82 mm |
| October | 4.7 °C | 15.9 °C | 109.47 mm |
| November | -0.9 °C | 8.7 °C | 88.65 mm |
| December | -5.9 °C | 2.3 °C | 97.54 mm |
| Annual | 3.3 °C | 14.4 °C | 1174.24 mm |
| 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 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |