East Granby, Connecticut has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 39.8 °F (low) to 60 °F (high). Annual precipitation averages 50.2 Inches. 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 | 17.2 °F | 34.7 °F | 3.55 in. |
| February | 18.6 °F | 37.5 °F | 3.19 in. |
| March | 26.6 °F | 45.8 °F | 4.18 in. |
| April | 37.3 °F | 59.1 °F | 4.06 in. |
| May | 47.7 °F | 70.2 °F | 3.77 in. |
| June | 57.0 °F | 78.5 °F | 4.46 in. |
| July | 62.3 °F | 83.8 °F | 4.22 in. |
| August | 60.6 °F | 82.0 °F | 4.28 in. |
| September | 53.1 °F | 74.9 °F | 4.69 in. |
| October | 41.6 °F | 62.5 °F | 5.32 in. |
| November | 32.0 °F | 50.8 °F | 3.83 in. |
| December | 23.6 °F | 40.0 °F | 4.61 in. |
| Annual | 39.8 °F | 60 °F | 50.16 in. |
| 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 : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |