Quinebaug, Connecticut has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.1 °F (low) to 59.7 °F (high). Annual precipitation averages 49.9 Inches. Quinebaug is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 16.3 °F | 35.8 °F | 3.86 in. |
| February | 17.5 °F | 38.2 °F | 3.34 in. |
| March | 25.1 °F | 45.9 °F | 4.44 in. |
| April | 35.0 °F | 58.6 °F | 4.42 in. |
| May | 45.2 °F | 69.4 °F | 3.55 in. |
| June | 54.3 °F | 77.4 °F | 4.31 in. |
| July | 60.6 °F | 82.6 °F | 3.97 in. |
| August | 58.4 °F | 80.7 °F | 4.31 in. |
| September | 51.4 °F | 73.9 °F | 4.24 in. |
| October | 40.4 °F | 62.0 °F | 4.91 in. |
| November | 30.4 °F | 51.2 °F | 3.89 in. |
| December | 22.4 °F | 41.0 °F | 4.63 in. |
| Annual | 38.1 °F | 59.7 °F | 49.87 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°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 |