Troy, Indiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.8 °F (low) to 67.2 °F (high). Annual precipitation averages 50.6 Inches. Troy is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 25.7 °F | 42.4 °F | 3.64 in. |
| February | 28.1 °F | 47.1 °F | 3.55 in. |
| March | 35.7 °F | 56.7 °F | 4.64 in. |
| April | 45.6 °F | 68.0 °F | 5.1 in. |
| May | 55.9 °F | 76.9 °F | 5.64 in. |
| June | 64.2 °F | 84.7 °F | 4.86 in. |
| July | 67.8 °F | 87.6 °F | 4.33 in. |
| August | 66.0 °F | 87.1 °F | 3.11 in. |
| September | 58.7 °F | 81.5 °F | 3.66 in. |
| October | 46.9 °F | 70.4 °F | 3.81 in. |
| November | 36.8 °F | 56.9 °F | 3.94 in. |
| December | 29.7 °F | 46.5 °F | 4.34 in. |
| Annual | 46.8 °F | 67.2 °F | 50.62 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |