Powell, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6 °C (low) to 16.6 °C (high). Annual precipitation averages 1041.4 Millimeters. Powell 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.3 °C | 2 °C | 75.69 mm |
| February | -5.3 °C | 3.8 °C | 60.2 mm |
| March | -0.7 °C | 9.8 °C | 85.34 mm |
| April | 5 °C | 17.1 °C | 98.04 mm |
| May | 11.1 °C | 22.9 °C | 106.68 mm |
| June | 16.1 °C | 27.4 °C | 113.54 mm |
| July | 17.9 °C | 28.9 °C | 105.66 mm |
| August | 16.9 °C | 28.3 °C | 86.36 mm |
| September | 12.8 °C | 25.3 °C | 83.06 mm |
| October | 6.4 °C | 18.3 °C | 72.39 mm |
| November | 0.8 °C | 10.9 °C | 76.2 mm |
| December | -3.2 °C | 4.7 °C | 78.23 mm |
| Annual | 6 °C | 16.6 °C | 1041.39 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| 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 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |