Troy, Michigan has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.5 °C (low) to 14.8 °C (high). Annual precipitation averages 861.1 Millimeters. Troy 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 | -8.2 °C | -0.2 °C | 60.2 mm |
| February | -7.6 °C | 1.4 °C | 49.78 mm |
| March | -3.4 °C | 6.9 °C | 57.91 mm |
| April | 2.7 °C | 14.3 °C | 76.96 mm |
| May | 8.7 °C | 20.9 °C | 96.52 mm |
| June | 14.4 °C | 26.3 °C | 81.79 mm |
| July | 16.7 °C | 28.6 °C | 85.34 mm |
| August | 16.3 °C | 27.6 °C | 82.8 mm |
| September | 12.2 °C | 23.8 °C | 76.96 mm |
| October | 5.9 °C | 16.4 °C | 72.14 mm |
| November | 0.4 °C | 9 °C | 62.74 mm |
| December | -4.4 °C | 2.4 °C | 57.91 mm |
| Annual | 4.5 °C | 14.8 °C | 861.05 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 |