Jacksonville, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.9 °F (low) to 63.3 °F (high). Annual precipitation averages 42.1 Inches. 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 | 17.6 °F | 35.6 °F | 1.71 in. |
| February | 21.2 °F | 40.9 °F | 1.99 in. |
| March | 31.4 °F | 52.5 °F | 2.83 in. |
| April | 42.2 °F | 64.1 °F | 4.38 in. |
| May | 53.2 °F | 73.5 °F | 5.36 in. |
| June | 62.7 °F | 82.5 °F | 5.39 in. |
| July | 66.5 °F | 86.8 °F | 4.64 in. |
| August | 64.2 °F | 85.7 °F | 3.89 in. |
| September | 55.4 °F | 78.3 °F | 4.0 in. |
| October | 44.3 °F | 66.7 °F | 3.31 in. |
| November | 33.1 °F | 52.8 °F | 2.6 in. |
| December | 23.4 °F | 40.3 °F | 1.96 in. |
| Annual | 42.9 °F | 63.3 °F | 42.06 in. |
| 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 : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |