Troy, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.1 °C (low) to 25.7 °C (high). Annual precipitation averages 956.3 Millimeters. Troy is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.5 °C | 15.2 °C | 69.85 mm |
| February | 4.6 °C | 17.3 °C | 66.04 mm |
| March | 8.6 °C | 21.1 °C | 84.84 mm |
| April | 12.7 °C | 25.3 °C | 72.14 mm |
| May | 17.6 °C | 29.3 °C | 113.54 mm |
| June | 21.4 °C | 33.1 °C | 91.19 mm |
| July | 22.8 °C | 35.2 °C | 46.74 mm |
| August | 22.8 °C | 35.7 °C | 79.5 mm |
| September | 19.3 °C | 32.1 °C | 82.55 mm |
| October | 13.6 °C | 26.9 °C | 94.49 mm |
| November | 8 °C | 20.6 °C | 77.98 mm |
| December | 3.6 °C | 16 °C | 77.47 mm |
| Annual | 13.1 °C | 25.7 °C | 956.33 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |