Benham, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 6.6 °C (low) to 18.8 °C (high). Annual precipitation averages 1344.4 Millimeters. Benham is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.1 °C | 6.8 °C | 105.92 mm |
| February | -2.6 °C | 8.9 °C | 107.19 mm |
| March | 0.9 °C | 13.8 °C | 128.52 mm |
| April | 5.9 °C | 19.4 °C | 124.97 mm |
| May | 10.8 °C | 23.6 °C | 119.63 mm |
| June | 15.1 °C | 27.7 °C | 116.59 mm |
| July | 17.4 °C | 29 °C | 142.24 mm |
| August | 16.8 °C | 28.1 °C | 110.74 mm |
| September | 13.3 °C | 26.1 °C | 96.77 mm |
| October | 6.8 °C | 19.7 °C | 77.98 mm |
| November | 1.1 °C | 13.9 °C | 91.44 mm |
| December | -1.7 °C | 8.8 °C | 122.43 mm |
| Annual | 6.6 °C | 18.8 °C | 1344.42 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |