Fort Thomas, Arizona has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 8.5 °C (low) to 28.2 °C (high). Annual precipitation averages 229.9 Millimeters. Fort Thomas 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 | -1.4 °C | 17.1 °C | 22.1 mm |
| February | 0.4 °C | 19.7 °C | 25.91 mm |
| March | 3.1 °C | 23.7 °C | 11.68 mm |
| April | 6.3 °C | 28.3 °C | 8.38 mm |
| May | 11.1 °C | 33.3 °C | 4.57 mm |
| June | 16.4 °C | 38.1 °C | 4.83 mm |
| July | 20.9 °C | 38.2 °C | 35.05 mm |
| August | 20.2 °C | 37.1 °C | 35.56 mm |
| September | 16.1 °C | 34.4 °C | 25.15 mm |
| October | 8.5 °C | 29.6 °C | 18.8 mm |
| November | 2.3 °C | 22.3 °C | 13.21 mm |
| December | -1.8 °C | 16.4 °C | 24.64 mm |
| Annual | 8.5 °C | 28.2 °C | 229.88 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 40-50 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 | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |