Cavour, South Dakota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 1.3 °C (low) to 13.9 °C (high). Annual precipitation averages 606.5 Millimeters. Cavour is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -14.6 °C | -3.8 °C | 13.72 mm |
| February | -12.3 °C | -0.8 °C | 17.02 mm |
| March | -6 °C | 6 °C | 24.89 mm |
| April | 0.6 °C | 14.1 °C | 60.96 mm |
| May | 7.8 °C | 20.8 °C | 82.55 mm |
| June | 13.9 °C | 26.4 °C | 99.82 mm |
| July | 16.4 °C | 29.6 °C | 82.04 mm |
| August | 15 °C | 28.5 °C | 70.36 mm |
| September | 9.8 °C | 24.2 °C | 63.75 mm |
| October | 2.1 °C | 15.9 °C | 54.86 mm |
| November | -5.4 °C | 6.6 °C | 20.57 mm |
| December | -11.6 °C | -1.1 °C | 16 mm |
| Annual | 1.3 °C | 13.9 °C | 606.54 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |