Jacksonville, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.6 °C (low) to 17.5 °C (high). Annual precipitation averages 1082.8 Millimeters. Jacksonville is located in USDA Plant Hardiness Zone 6b. 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 | -6.9 °C | 3.6 °C | 83.57 mm |
| February | -6.2 °C | 5.5 °C | 70.1 mm |
| March | -2.1 °C | 10.9 °C | 94.49 mm |
| April | 3.4 °C | 18.6 °C | 95.5 mm |
| May | 9.2 °C | 23.2 °C | 106.68 mm |
| June | 14.3 °C | 27.6 °C | 113.54 mm |
| July | 16.5 °C | 29.3 °C | 112.52 mm |
| August | 15.6 °C | 28.9 °C | 85.09 mm |
| September | 11.2 °C | 25.1 °C | 88.14 mm |
| October | 4.4 °C | 18.8 °C | 77.22 mm |
| November | -0.7 °C | 12.3 °C | 75.44 mm |
| December | -3.9 °C | 6.2 °C | 80.52 mm |
| Annual | 4.6 °C | 17.5 °C | 1082.81 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |