Shelton, 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 °C (high). Annual precipitation averages 1294.9 Millimeters. Shelton is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.3 °C | 2.9 °C | 97.03 mm |
| February | -5.6 °C | 4.2 °C | 86.11 mm |
| March | -1.5 °C | 8.2 °C | 116.84 mm |
| April | 4.1 °C | 14.6 °C | 109.22 mm |
| May | 9.7 °C | 20.8 °C | 104.65 mm |
| June | 14.9 °C | 25.4 °C | 114.05 mm |
| July | 18.1 °C | 28.7 °C | 97.03 mm |
| August | 17.2 °C | 27.7 °C | 104.14 mm |
| September | 13.3 °C | 24.3 °C | 124.21 mm |
| October | 6.7 °C | 17.8 °C | 123.95 mm |
| November | 1.3 °C | 11.4 °C | 104.9 mm |
| December | -3.1 °C | 5.8 °C | 112.78 mm |
| Annual | 5.7 °C | 16 °C | 1294.91 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 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 | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |