Tolstoy, South Dakota has a Humid Continental Hot Summers With Dry Winters climate (Köppen classification: Dwa). Average annual temperatures range from 0.3 °C (low) to 12.8 °C (high). Annual precipitation averages 513.3 Millimeters. Tolstoy 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 Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -15.3 °C | -4.8 °C | 10.41 mm |
| February | -13.1 °C | -2.3 °C | 14.48 mm |
| March | -7.1 °C | 4.7 °C | 21.08 mm |
| April | -0.6 °C | 12.9 °C | 44.45 mm |
| May | 6.3 °C | 19.8 °C | 77.22 mm |
| June | 12.4 °C | 25.3 °C | 90.17 mm |
| July | 15.1 °C | 28.8 °C | 75.44 mm |
| August | 14.1 °C | 28.2 °C | 59.18 mm |
| September | 8.7 °C | 23.3 °C | 50.55 mm |
| October | 1.4 °C | 14.4 °C | 42.67 mm |
| November | -6 °C | 5.3 °C | 14.99 mm |
| December | -12.1 °C | -2.2 °C | 12.7 mm |
| Annual | 0.3 °C | 12.8 °C | 513.34 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| 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 | Dwa - Humid Continental Hot Summers With Dry Winters |