Trenton, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.4 °C (low) to 20.3 °C (high). Annual precipitation averages 1339.6 Millimeters. Trenton is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.2 °C | 7.1 °C | 100.33 mm |
| February | -1.6 °C | 9.7 °C | 111.25 mm |
| March | 2.5 °C | 14.8 °C | 123.95 mm |
| April | 7.8 °C | 20.6 °C | 131.06 mm |
| May | 13.4 °C | 25.2 °C | 139.7 mm |
| June | 18.1 °C | 29.6 °C | 110.49 mm |
| July | 20.1 °C | 31.3 °C | 118.11 mm |
| August | 18.9 °C | 31.2 °C | 87.12 mm |
| September | 14.9 °C | 28.1 °C | 94.23 mm |
| October | 8.4 °C | 21.8 °C | 100.58 mm |
| November | 2.3 °C | 14.8 °C | 99.31 mm |
| December | -1.2 °C | 9.1 °C | 123.44 mm |
| Annual | 8.4 °C | 20.3 °C | 1339.57 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 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 | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |