Terramuggus, Connecticut has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.3 °C (low) to 15.4 °C (high). Annual precipitation averages 1275.1 Millimeters. Terramuggus 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 | -7.4 °C | 2.2 °C | 94.49 mm |
| February | -6.8 °C | 3.6 °C | 82.3 mm |
| March | -2.8 °C | 7.8 °C | 113.79 mm |
| April | 2.7 °C | 14.7 °C | 108.71 mm |
| May | 8.1 °C | 20.3 °C | 95 mm |
| June | 13.3 °C | 24.9 °C | 112.27 mm |
| July | 16.4 °C | 27.8 °C | 103.12 mm |
| August | 15.6 °C | 27.1 °C | 108.97 mm |
| September | 11.5 °C | 23.3 °C | 114.3 mm |
| October | 5.4 °C | 16.9 °C | 126.24 mm |
| November | 0.2 °C | 10.8 °C | 100.33 mm |
| December | -4.1 °C | 5.3 °C | 115.57 mm |
| Annual | 4.3 °C | 15.4 °C | 1275.09 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°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 |