Middletown, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.3 °C (low) to 15.6 °C (high). Annual precipitation averages 1139.5 Millimeters. Middletown 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.1 °C | 1.5 °C | 73.66 mm |
| February | -7.3 °C | 3.3 °C | 59.44 mm |
| March | -3.1 °C | 7.9 °C | 83.06 mm |
| April | 2.9 °C | 15.4 °C | 98.3 mm |
| May | 8.8 °C | 21.3 °C | 91.44 mm |
| June | 14 °C | 26 °C | 118.87 mm |
| July | 16.5 °C | 28.6 °C | 103.63 mm |
| August | 15.6 °C | 27.5 °C | 111.76 mm |
| September | 11.6 °C | 23.7 °C | 110.74 mm |
| October | 5.3 °C | 16.9 °C | 108.46 mm |
| November | -0.1 °C | 10.4 °C | 86.11 mm |
| December | -4.6 °C | 4.2 °C | 93.98 mm |
| Annual | 4.3 °C | 15.6 °C | 1139.45 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |