Long Hill, Connecticut has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.9 °F (low) to 60.2 °F (high). Annual precipitation averages 51.1 Inches. Long Hill is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 20.4 °F | 36.5 °F | 3.89 in. |
| February | 21.6 °F | 38.9 °F | 3.21 in. |
| March | 28.6 °F | 46.7 °F | 4.45 in. |
| April | 38.4 °F | 58.7 °F | 4.2 in. |
| May | 48.2 °F | 69.5 °F | 4.04 in. |
| June | 57.8 °F | 77.8 °F | 4.82 in. |
| July | 63.8 °F | 82.9 °F | 3.69 in. |
| August | 62.8 °F | 81.0 °F | 4.47 in. |
| September | 55.6 °F | 74.1 °F | 4.79 in. |
| October | 44.4 °F | 62.7 °F | 4.88 in. |
| November | 34.3 °F | 51.7 °F | 4.23 in. |
| December | 26.5 °F | 41.5 °F | 4.44 in. |
| Annual | 41.9 °F | 60.2 °F | 51.11 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |