Fredericktown, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 44.2 °F (low) to 67.1 °F (high). Annual precipitation averages 46.2 Inches. Fredericktown 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 | 22.5 °F | 42.3 °F | 2.97 in. |
| February | 25.5 °F | 47.7 °F | 2.85 in. |
| March | 33.6 °F | 57.6 °F | 3.73 in. |
| April | 43.2 °F | 68.6 °F | 5.46 in. |
| May | 53.9 °F | 76.4 °F | 5.73 in. |
| June | 61.9 °F | 84.5 °F | 3.44 in. |
| July | 66.2 °F | 88.0 °F | 3.75 in. |
| August | 64.0 °F | 87.3 °F | 3.42 in. |
| September | 55.7 °F | 80.8 °F | 3.39 in. |
| October | 43.9 °F | 69.9 °F | 3.47 in. |
| November | 34.0 °F | 56.2 °F | 4.6 in. |
| December | 26.2 °F | 45.4 °F | 3.38 in. |
| Annual | 44.2 °F | 67.1 °F | 46.19 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 | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |