Sparta, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.4 °C (low) to 19 °C (high). Annual precipitation averages 1243.1 Millimeters. Sparta 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.9 °C | 5.9 °C | 68.58 mm |
| February | -3.1 °C | 8.6 °C | 67.06 mm |
| March | 1.4 °C | 13.7 °C | 113.79 mm |
| April | 6.8 °C | 19.3 °C | 127.76 mm |
| May | 12.4 °C | 23.6 °C | 147.32 mm |
| June | 17.2 °C | 28.1 °C | 113.79 mm |
| July | 19.6 °C | 30.7 °C | 116.84 mm |
| August | 18.6 °C | 30.3 °C | 87.63 mm |
| September | 14.2 °C | 26.4 °C | 116.84 mm |
| October | 7.8 °C | 20.3 °C | 101.09 mm |
| November | 1.8 °C | 13.4 °C | 102.62 mm |
| December | -2.9 °C | 7.6 °C | 79.76 mm |
| Annual | 7.4 °C | 19 °C | 1243.08 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |