Cassville, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.5 °C (low) to 19.6 °C (high). Annual precipitation averages 1186.7 Millimeters. Cassville is located in USDA Plant Hardiness Zone 7a. 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 | -4.8 °C | 6.7 °C | 73.41 mm |
| February | -2.8 °C | 9.2 °C | 60.2 mm |
| March | 1.9 °C | 14.3 °C | 100.33 mm |
| April | 6.8 °C | 19.6 °C | 124.46 mm |
| May | 12.3 °C | 23.9 °C | 147.57 mm |
| June | 17.3 °C | 28.7 °C | 107.7 mm |
| July | 19.6 °C | 31.3 °C | 90.17 mm |
| August | 18.7 °C | 31.1 °C | 84.33 mm |
| September | 14.2 °C | 27.1 °C | 123.7 mm |
| October | 7.7 °C | 20.9 °C | 99.31 mm |
| November | 2 °C | 14.2 °C | 95.25 mm |
| December | -2.7 °C | 8.6 °C | 80.26 mm |
| Annual | 7.5 °C | 19.6 °C | 1186.69 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |