Derby, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.9 °C (low) to 16.8 °C (high). Annual precipitation averages 1045.2 Millimeters. Derby 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 | -6.2 °C | 2.3 °C | 79.76 mm |
| February | -5.2 °C | 4.2 °C | 59.94 mm |
| March | -0.8 °C | 10 °C | 85.6 mm |
| April | 5 °C | 17.2 °C | 94.74 mm |
| May | 11.2 °C | 22.9 °C | 117.35 mm |
| June | 16.1 °C | 27.4 °C | 114.55 mm |
| July | 17.8 °C | 29 °C | 104.14 mm |
| August | 16.7 °C | 28.4 °C | 93.22 mm |
| September | 12.6 °C | 25.4 °C | 76.96 mm |
| October | 6.3 °C | 18.6 °C | 67.06 mm |
| November | 0.7 °C | 11 °C | 79.5 mm |
| December | -3.2 °C | 4.9 °C | 72.39 mm |
| Annual | 5.9 °C | 16.8 °C | 1045.21 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 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |