Clarksville, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.7 °F (low) to 64.1 °F (high). Annual precipitation averages 38.9 Inches. Clarksville is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 19.3 °F | 36.6 °F | 2.16 in. |
| February | 22.7 °F | 41.7 °F | 1.91 in. |
| March | 32.1 °F | 52.7 °F | 2.83 in. |
| April | 42.7 °F | 65.2 °F | 4.03 in. |
| May | 53.8 °F | 74.6 °F | 4.53 in. |
| June | 63.0 °F | 83.6 °F | 4.48 in. |
| July | 66.8 °F | 87.2 °F | 3.84 in. |
| August | 64.7 °F | 86.0 °F | 3.54 in. |
| September | 56.2 °F | 79.5 °F | 3.45 in. |
| October | 44.7 °F | 67.4 °F | 2.93 in. |
| November | 33.8 °F | 53.2 °F | 2.99 in. |
| December | 24.4 °F | 41.1 °F | 2.17 in. |
| Annual | 43.7 °F | 64.1 °F | 38.86 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |