Clarkton, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 49.8 °F (low) to 69.1 °F (high). Annual precipitation averages 50 Inches. Clarkton is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 28.1 °F | 44.1 °F | 3.48 in. |
| February | 31.3 °F | 49.2 °F | 3.89 in. |
| March | 39.2 °F | 58.7 °F | 4.74 in. |
| April | 49.1 °F | 70.1 °F | 5.48 in. |
| May | 59.7 °F | 79.3 °F | 5.3 in. |
| June | 68.1 °F | 87.6 °F | 3.59 in. |
| July | 71.5 °F | 90.0 °F | 4.06 in. |
| August | 69.2 °F | 89.0 °F | 2.94 in. |
| September | 61.3 °F | 83.2 °F | 3.38 in. |
| October | 49.4 °F | 72.4 °F | 4.01 in. |
| November | 39.0 °F | 58.4 °F | 4.51 in. |
| December | 31.3 °F | 47.5 °F | 4.63 in. |
| Annual | 49.8 °F | 69.1 °F | 50.01 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |