Benton, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.8 °C (low) to 20.5 °C (high). Annual precipitation averages 1342.4 Millimeters. Benton is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.8 °C | 7.2 °C | 100.08 mm |
| February | -1.3 °C | 9.7 °C | 107.7 mm |
| March | 3.2 °C | 15.2 °C | 123.7 mm |
| April | 8.3 °C | 21.2 °C | 130.81 mm |
| May | 13.8 °C | 25.7 °C | 144.02 mm |
| June | 18.5 °C | 29.9 °C | 122.68 mm |
| July | 20.6 °C | 31.8 °C | 109.98 mm |
| August | 19.3 °C | 31.6 °C | 88.65 mm |
| September | 15.2 °C | 28.2 °C | 90.93 mm |
| October | 8.7 °C | 21.8 °C | 95.5 mm |
| November | 2.8 °C | 14.8 °C | 101.6 mm |
| December | -1.2 °C | 9.1 °C | 126.75 mm |
| Annual | 8.8 °C | 20.5 °C | 1342.4 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |