Sandy Hook, Connecticut has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.9 °C (low) to 16.1 °C (high). Annual precipitation averages 1304.3 Millimeters. Sandy Hook 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 | -7.2 °C | 2.6 °C | 99.57 mm |
| February | -6.3 °C | 4.1 °C | 80.26 mm |
| March | -2.3 °C | 8.3 °C | 112.27 mm |
| April | 3.3 °C | 15.3 °C | 105.16 mm |
| May | 8.9 °C | 21.6 °C | 101.35 mm |
| June | 14.2 °C | 26.1 °C | 119.13 mm |
| July | 17.3 °C | 28.9 °C | 113.28 mm |
| August | 16.4 °C | 27.9 °C | 114.55 mm |
| September | 12.3 °C | 24 °C | 116.59 mm |
| October | 5.8 °C | 17.6 °C | 123.44 mm |
| November | 0.3 °C | 11.1 °C | 106.17 mm |
| December | -3.9 °C | 5.3 °C | 112.52 mm |
| Annual | 4.9 °C | 16.1 °C | 1304.29 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 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |