Vivian, South Dakota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 34.7 °F (low) to 60.1 °F (high). Annual precipitation averages 20.4 Inches. 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 | 9.5 °F | 30.9 °F | 0.46 in. |
| February | 12.6 °F | 35.6 °F | 0.67 in. |
| March | 22.0 °F | 47.1 °F | 1.09 in. |
| April | 32.6 °F | 58.9 °F | 2.3 in. |
| May | 44.3 °F | 69.7 °F | 3.28 in. |
| June | 54.9 °F | 80.3 °F | 3.33 in. |
| July | 61.0 °F | 88.6 °F | 2.63 in. |
| August | 58.7 °F | 87.5 °F | 2.3 in. |
| September | 49.1 °F | 78.8 °F | 1.62 in. |
| October | 35.9 °F | 62.9 °F | 1.53 in. |
| November | 22.6 °F | 46.9 °F | 0.69 in. |
| December | 13.0 °F | 34.4 °F | 0.48 in. |
| Annual | 34.7 °F | 60.1 °F | 20.38 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |