Cassville, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.4 °C (low) to 14.4 °C (high). Annual precipitation averages 950 Millimeters. Cassville is located in USDA Plant Hardiness Zone 5a. 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 | -12 °C | -2.6 °C | 31.75 mm |
| February | -10.1 °C | 0 °C | 32.26 mm |
| March | -3.5 °C | 7.1 °C | 50.29 mm |
| April | 2.9 °C | 14.8 °C | 94.74 mm |
| May | 9.3 °C | 21.4 °C | 114.05 mm |
| June | 15.1 °C | 26.7 °C | 145.29 mm |
| July | 17.2 °C | 28.6 °C | 120.65 mm |
| August | 16 °C | 27.6 °C | 97.54 mm |
| September | 11.3 °C | 23.8 °C | 96.52 mm |
| October | 4.6 °C | 16.5 °C | 71.63 mm |
| November | -2.1 °C | 7.7 °C | 53.85 mm |
| December | -8.1 °C | 0.6 °C | 41.4 mm |
| Annual | 3.4 °C | 14.4 °C | 949.97 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |