North Grosvenor Dale, Connecticut has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.5 °C (low) to 15.6 °C (high). Annual precipitation averages 1274.6 Millimeters. North Grosvenor Dale is located in USDA Plant Hardiness Zone 6a. 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 | -8.6 °C | 2.3 °C | 100.08 mm |
| February | -7.9 °C | 3.6 °C | 86.87 mm |
| March | -3.7 °C | 7.9 °C | 113.28 mm |
| April | 1.8 °C | 14.9 °C | 113.79 mm |
| May | 7.4 °C | 20.9 °C | 88.39 mm |
| June | 12.4 °C | 25.3 °C | 111 mm |
| July | 15.9 °C | 28.2 °C | 100.58 mm |
| August | 14.8 °C | 27.2 °C | 108.71 mm |
| September | 10.9 °C | 23.4 °C | 106.93 mm |
| October | 4.7 °C | 16.9 °C | 123.7 mm |
| November | -0.7 °C | 10.8 °C | 101.85 mm |
| December | -5.2 °C | 5.2 °C | 119.38 mm |
| Annual | 3.5 °C | 15.6 °C | 1274.56 mm |
| 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 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 |