Fort Thomas, Kentucky has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.2 °C (low) to 18.1 °C (high). Annual precipitation averages 1127.8 Millimeters. Fort Thomas 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 | -5 °C | 3.9 °C | 82.8 mm |
| February | -3.7 °C | 6.3 °C | 73.15 mm |
| March | 0.7 °C | 11.6 °C | 103.12 mm |
| April | 6.6 °C | 18.6 °C | 110.49 mm |
| May | 12.3 °C | 23.6 °C | 122.17 mm |
| June | 17.2 °C | 28.6 °C | 112.78 mm |
| July | 18.9 °C | 30.1 °C | 102.87 mm |
| August | 18.1 °C | 29.7 °C | 90.42 mm |
| September | 14.2 °C | 26.2 °C | 77.22 mm |
| October | 7.7 °C | 19.8 °C | 78.74 mm |
| November | 1.8 °C | 12.1 °C | 83.82 mm |
| December | -2.2 °C | 6.2 °C | 90.17 mm |
| Annual | 7.2 °C | 18.1 °C | 1127.75 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 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |