Jamestown, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.6 °C (low) to 19.5 °C (high). Annual precipitation averages 1445 Millimeters. Jamestown 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.3 °C | 6.8 °C | 121.92 mm |
| February | -1.8 °C | 9.2 °C | 121.41 mm |
| March | 1.7 °C | 14.3 °C | 137.92 mm |
| April | 6.9 °C | 20.1 °C | 126.49 mm |
| May | 12.2 °C | 24.3 °C | 132.59 mm |
| June | 16.7 °C | 28.3 °C | 128.52 mm |
| July | 18.8 °C | 30 °C | 131.57 mm |
| August | 17.7 °C | 29.7 °C | 100.08 mm |
| September | 14 °C | 26.9 °C | 111.76 mm |
| October | 7.8 °C | 20.9 °C | 86.87 mm |
| November | 1.7 °C | 14.4 °C | 99.57 mm |
| December | -1.1 °C | 8.8 °C | 146.3 mm |
| Annual | 7.6 °C | 19.5 °C | 1445 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |