Troy, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.1 °C (low) to 16.8 °C (high). Annual precipitation averages 1044.7 Millimeters. Troy is located in USDA Plant Hardiness Zone 6a. 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 | -6.5 °C | 2.2 °C | 76.2 mm |
| February | -5.3 °C | 4.2 °C | 58.42 mm |
| March | -0.7 °C | 9.9 °C | 81.28 mm |
| April | 5.2 °C | 17.2 °C | 104.65 mm |
| May | 11.4 °C | 22.9 °C | 116.08 mm |
| June | 16.4 °C | 27.6 °C | 112.27 mm |
| July | 18.1 °C | 29.3 °C | 109.98 mm |
| August | 17 °C | 28.7 °C | 78.99 mm |
| September | 12.9 °C | 25.6 °C | 80.01 mm |
| October | 6.6 °C | 18.7 °C | 71.37 mm |
| November | 0.9 °C | 11 °C | 78.23 mm |
| December | -3.4 °C | 4.7 °C | 77.22 mm |
| Annual | 6.1 °C | 16.8 °C | 1044.7 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 6a : -23.3°C to -20.6°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 |