McDermott, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6 °C (low) to 18.8 °C (high). Annual precipitation averages 1111.8 Millimeters. McDermott 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 | -5.1 °C | 5.2 °C | 84.33 mm |
| February | -4.1 °C | 7.3 °C | 79.25 mm |
| March | -0.4 °C | 12.7 °C | 103.89 mm |
| April | 4.9 °C | 19.7 °C | 103.12 mm |
| May | 10.7 °C | 24.3 °C | 115.57 mm |
| June | 15.6 °C | 28.7 °C | 109.22 mm |
| July | 17.6 °C | 30.3 °C | 115.06 mm |
| August | 16.7 °C | 30.3 °C | 83.57 mm |
| September | 12.6 °C | 26.8 °C | 83.57 mm |
| October | 6.1 °C | 20.4 °C | 75.69 mm |
| November | 0.4 °C | 13.1 °C | 70.61 mm |
| December | -2.6 °C | 7.3 °C | 87.88 mm |
| Annual | 6 °C | 18.8 °C | 1111.76 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 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |