Weston, Connecticut has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.7 °C (low) to 16.3 °C (high). Annual precipitation averages 1275.1 Millimeters. Weston 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.3 °C | 3.1 °C | 99.31 mm |
| February | -5.6 °C | 4.5 °C | 78.23 mm |
| March | -1.4 °C | 8.6 °C | 107.7 mm |
| April | 4.1 °C | 15.5 °C | 103.38 mm |
| May | 9.5 °C | 21.2 °C | 99.06 mm |
| June | 14.9 °C | 26 °C | 121.92 mm |
| July | 17.9 °C | 28.9 °C | 96.27 mm |
| August | 17.2 °C | 27.9 °C | 115.06 mm |
| September | 13.2 °C | 24.1 °C | 119.63 mm |
| October | 6.7 °C | 17.7 °C | 115.82 mm |
| November | 1.3 °C | 11.6 °C | 104.14 mm |
| December | -3 °C | 5.9 °C | 114.55 mm |
| Annual | 5.7 °C | 16.3 °C | 1275.07 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°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 |