Troy, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.1 °C (low) to 24.3 °C (high). Annual precipitation averages 1400 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. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.3 °C | 14.6 °C | 120.14 mm |
| February | 4.2 °C | 16.8 °C | 113.79 mm |
| March | 7.1 °C | 20.8 °C | 136.65 mm |
| April | 10.9 °C | 24.3 °C | 112.52 mm |
| May | 15.9 °C | 28.3 °C | 89.15 mm |
| June | 19.9 °C | 31.4 °C | 130.56 mm |
| July | 21.3 °C | 32.3 °C | 140.97 mm |
| August | 21.1 °C | 32 °C | 127 mm |
| September | 18.6 °C | 30 °C | 102.36 mm |
| October | 12.7 °C | 25.4 °C | 88.9 mm |
| November | 6.8 °C | 19.9 °C | 106.17 mm |
| December | 4 °C | 15.8 °C | 131.83 mm |
| Annual | 12.1 °C | 24.3 °C | 1400.04 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| 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 |