North Windham, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.7 °F (low) to 56 °F (high). Annual precipitation averages 50.4 Inches. 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 | 10.8 °F | 29.9 °F | 3.51 in. |
| February | 11.7 °F | 33.0 °F | 3.64 in. |
| March | 21.4 °F | 41.4 °F | 4.0 in. |
| April | 32.6 °F | 54.1 °F | 4.33 in. |
| May | 43.5 °F | 65.9 °F | 3.73 in. |
| June | 53.9 °F | 74.6 °F | 4.72 in. |
| July | 59.6 °F | 80.7 °F | 4.24 in. |
| August | 58.0 °F | 79.7 °F | 3.6 in. |
| September | 50.3 °F | 72.1 °F | 4.0 in. |
| October | 38.8 °F | 58.6 °F | 5.72 in. |
| November | 28.9 °F | 46.3 °F | 4.26 in. |
| December | 18.5 °F | 35.8 °F | 4.63 in. |
| Annual | 35.7 °F | 56 °F | 50.38 in. |
| 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 : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |