Vivian, South Dakota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 1.5 °C (low) to 15.6 °C (high). Annual precipitation averages 517.7 Millimeters. Vivian is located in USDA Plant Hardiness Zone 5a. 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 | -12.5 °C | -0.6 °C | 11.68 mm |
| February | -10.8 °C | 2 °C | 17.02 mm |
| March | -5.6 °C | 8.4 °C | 27.69 mm |
| April | 0.3 °C | 14.9 °C | 58.42 mm |
| May | 6.8 °C | 20.9 °C | 83.31 mm |
| June | 12.7 °C | 26.8 °C | 84.58 mm |
| July | 16.1 °C | 31.4 °C | 66.8 mm |
| August | 14.8 °C | 30.8 °C | 58.42 mm |
| September | 9.5 °C | 26 °C | 41.15 mm |
| October | 2.2 °C | 17.2 °C | 38.86 mm |
| November | -5.2 °C | 8.3 °C | 17.53 mm |
| December | -10.6 °C | 1.3 °C | 12.19 mm |
| Annual | 1.5 °C | 15.6 °C | 517.65 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 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |