North Windham, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2 °C (low) to 13.3 °C (high). Annual precipitation averages 1279.7 Millimeters. North Windham 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 | -11.8 °C | -1.2 °C | 89.15 mm |
| February | -11.3 °C | 0.6 °C | 92.46 mm |
| March | -5.9 °C | 5.2 °C | 101.6 mm |
| April | 0.3 °C | 12.3 °C | 109.98 mm |
| May | 6.4 °C | 18.8 °C | 94.74 mm |
| June | 12.2 °C | 23.7 °C | 119.89 mm |
| July | 15.3 °C | 27.1 °C | 107.7 mm |
| August | 14.4 °C | 26.5 °C | 91.44 mm |
| September | 10.2 °C | 22.3 °C | 101.6 mm |
| October | 3.8 °C | 14.8 °C | 145.29 mm |
| November | -1.7 °C | 7.9 °C | 108.2 mm |
| December | -7.5 °C | 2.1 °C | 117.6 mm |
| Annual | 2 °C | 13.3 °C | 1279.65 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 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |