Jacksonville, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.1 °C (low) to 17.4 °C (high). Annual precipitation averages 1068.3 Millimeters. Jacksonville is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8 °C | 2 °C | 43.43 mm |
| February | -6 °C | 4.9 °C | 50.55 mm |
| March | -0.3 °C | 11.4 °C | 71.88 mm |
| April | 5.7 °C | 17.8 °C | 111.25 mm |
| May | 11.8 °C | 23.1 °C | 136.14 mm |
| June | 17.1 °C | 28.1 °C | 136.91 mm |
| July | 19.2 °C | 30.4 °C | 117.86 mm |
| August | 17.9 °C | 29.8 °C | 98.81 mm |
| September | 13 °C | 25.7 °C | 101.6 mm |
| October | 6.8 °C | 19.3 °C | 84.07 mm |
| November | 0.6 °C | 11.6 °C | 66.04 mm |
| December | -4.8 °C | 4.6 °C | 49.78 mm |
| Annual | 6.1 °C | 17.4 °C | 1068.32 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |