Cornville, Maine has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.3 °F (low) to 53.8 °F (high). Annual precipitation averages 44.7 Inches. Cornville is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 5.9 °F | 26.5 °F | 3.22 in. |
| February | 7.2 °F | 30.1 °F | 2.66 in. |
| March | 17.6 °F | 38.8 °F | 3.35 in. |
| April | 29.9 °F | 51.8 °F | 3.81 in. |
| May | 41.2 °F | 64.9 °F | 3.52 in. |
| June | 50.9 °F | 73.5 °F | 4.4 in. |
| July | 56.5 °F | 78.8 °F | 3.73 in. |
| August | 54.6 °F | 77.7 °F | 3.61 in. |
| September | 46.6 °F | 70.3 °F | 3.58 in. |
| October | 36.0 °F | 56.7 °F | 4.95 in. |
| November | 26.5 °F | 44.0 °F | 4.0 in. |
| December | 14.8 °F | 32.6 °F | 3.89 in. |
| Annual | 32.3 °F | 53.8 °F | 44.72 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |