Quinebaug, Connecticut has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.4 °C (low) to 15.4 °C (high). Annual precipitation averages 1266.7 Millimeters. 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 | -8.7 °C | 2.1 °C | 98.04 mm |
| February | -8.1 °C | 3.4 °C | 84.84 mm |
| March | -3.8 °C | 7.7 °C | 112.78 mm |
| April | 1.7 °C | 14.8 °C | 112.27 mm |
| May | 7.3 °C | 20.8 °C | 90.17 mm |
| June | 12.4 °C | 25.2 °C | 109.47 mm |
| July | 15.9 °C | 28.1 °C | 100.84 mm |
| August | 14.7 °C | 27.1 °C | 109.47 mm |
| September | 10.8 °C | 23.3 °C | 107.7 mm |
| October | 4.7 °C | 16.7 °C | 124.71 mm |
| November | -0.9 °C | 10.7 °C | 98.81 mm |
| December | -5.3 °C | 5 °C | 117.6 mm |
| Annual | 3.4 °C | 15.4 °C | 1266.7 mm |
| 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 : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |