East Granby, Connecticut has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.3 °C (low) to 15.5 °C (high). Annual precipitation averages 1274.1 Millimeters. East Granby 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 | -8.2 °C | 1.5 °C | 90.17 mm |
| February | -7.4 °C | 3.1 °C | 81.03 mm |
| March | -3 °C | 7.7 °C | 106.17 mm |
| April | 2.9 °C | 15.1 °C | 103.12 mm |
| May | 8.7 °C | 21.2 °C | 95.76 mm |
| June | 13.9 °C | 25.8 °C | 113.28 mm |
| July | 16.8 °C | 28.8 °C | 107.19 mm |
| August | 15.9 °C | 27.8 °C | 108.71 mm |
| September | 11.7 °C | 23.8 °C | 119.13 mm |
| October | 5.3 °C | 16.9 °C | 135.13 mm |
| November | 0 °C | 10.4 °C | 97.28 mm |
| December | -4.7 °C | 4.4 °C | 117.09 mm |
| Annual | 4.3 °C | 15.5 °C | 1274.06 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 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 | Dfa - Humid Continental Hot Summers With Year Around Precipitation |