Higganum, Connecticut has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 5.1 °C (low) to 16 °C (high). Annual precipitation averages 1333.8 Millimeters. Higganum is located in USDA Plant Hardiness Zone 6b. 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 | -7 °C | 2.8 °C | 102.11 mm |
| February | -6.1 °C | 4.3 °C | 87.38 mm |
| March | -1.9 °C | 8.6 °C | 119.89 mm |
| April | 3.6 °C | 15.3 °C | 115.57 mm |
| May | 9.1 °C | 20.9 °C | 96.52 mm |
| June | 14.3 °C | 25.7 °C | 124.21 mm |
| July | 17.6 °C | 28.6 °C | 100.08 mm |
| August | 16.7 °C | 27.9 °C | 111.76 mm |
| September | 12.3 °C | 23.8 °C | 113.54 mm |
| October | 5.9 °C | 17.3 °C | 134.62 mm |
| November | 0.6 °C | 11.3 °C | 107.44 mm |
| December | -3.8 °C | 5.8 °C | 120.65 mm |
| Annual | 5.1 °C | 16 °C | 1333.77 mm |
| 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 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |