Vienna, South Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.5 °C (low) to 11.9 °C (high). Annual precipitation averages 631.4 Millimeters. Vienna 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 | -16 °C | -5.8 °C | 14.22 mm |
| February | -14 °C | -3.1 °C | 16.51 mm |
| March | -7.3 °C | 3.7 °C | 27.18 mm |
| April | -0.2 °C | 12.1 °C | 60.45 mm |
| May | 7.1 °C | 19.1 °C | 83.06 mm |
| June | 13.1 °C | 24.6 °C | 105.41 mm |
| July | 15.7 °C | 27.4 °C | 85.85 mm |
| August | 14.2 °C | 26.4 °C | 75.18 mm |
| September | 9.3 °C | 22.1 °C | 68.07 mm |
| October | 1.7 °C | 13.8 °C | 57.15 mm |
| November | -5.8 °C | 4.8 °C | 21.34 mm |
| December | -12.2 °C | -2.8 °C | 17.02 mm |
| Annual | 0.5 °C | 11.9 °C | 631.44 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |