Coventry Lake, Connecticut has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 39.1 °F (low) to 59 °F (high). Annual precipitation averages 49.6 Inches. Coventry Lake 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 | 17.5 °F | 35.2 °F | 3.57 in. |
| February | 18.6 °F | 37.8 °F | 3.08 in. |
| March | 26.3 °F | 45.5 °F | 4.34 in. |
| April | 36.2 °F | 57.6 °F | 4.41 in. |
| May | 46.0 °F | 68.1 °F | 3.61 in. |
| June | 55.3 °F | 76.4 °F | 4.36 in. |
| July | 61.0 °F | 81.4 °F | 3.99 in. |
| August | 59.2 °F | 79.9 °F | 4.46 in. |
| September | 52.1 °F | 73.2 °F | 4.57 in. |
| October | 40.9 °F | 61.6 °F | 4.87 in. |
| November | 31.6 °F | 50.8 °F | 3.9 in. |
| December | 24.0 °F | 40.9 °F | 4.41 in. |
| Annual | 39.1 °F | 59 °F | 49.57 in. |
| 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 : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |