Sundown, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.4 °F (low) to 70 °F (high). Annual precipitation averages 46 Inches. Sundown is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 25.7 °F | 46.9 °F | 2.92 in. |
| February | 28.8 °F | 51.8 °F | 2.83 in. |
| March | 36.3 °F | 60.6 °F | 4.4 in. |
| April | 45.3 °F | 71.2 °F | 5.16 in. |
| May | 54.8 °F | 77.8 °F | 4.99 in. |
| June | 63.8 °F | 86.3 °F | 3.85 in. |
| July | 67.3 °F | 90.5 °F | 3.69 in. |
| August | 65.4 °F | 90.0 °F | 3.21 in. |
| September | 57.7 °F | 82.9 °F | 3.79 in. |
| October | 46.2 °F | 72.4 °F | 3.63 in. |
| November | 36.6 °F | 60.0 °F | 4.27 in. |
| December | 28.7 °F | 49.6 °F | 3.24 in. |
| Annual | 46.4 °F | 70 °F | 45.98 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |