Troy, Michigan has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.1 °F (low) to 58.6 °F (high). Annual precipitation averages 33.9 Inches. 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 | 17.3 °F | 31.6 °F | 2.37 in. |
| February | 18.3 °F | 34.6 °F | 1.96 in. |
| March | 25.8 °F | 44.5 °F | 2.28 in. |
| April | 36.8 °F | 57.7 °F | 3.03 in. |
| May | 47.7 °F | 69.7 °F | 3.8 in. |
| June | 58.0 °F | 79.3 °F | 3.22 in. |
| July | 62.0 °F | 83.4 °F | 3.36 in. |
| August | 61.4 °F | 81.6 °F | 3.26 in. |
| September | 53.9 °F | 74.9 °F | 3.03 in. |
| October | 42.6 °F | 61.5 °F | 2.84 in. |
| November | 32.8 °F | 48.2 °F | 2.47 in. |
| December | 24.1 °F | 36.4 °F | 2.28 in. |
| Annual | 40.1 °F | 58.6 °F | 33.9 in. |
| 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 : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |