Tolstoy, South Dakota has a Humid Continental Hot Summers With Dry Winters climate (Köppen classification: Dwa). Average annual temperatures range from 32.6 °F (low) to 55 °F (high). Annual precipitation averages 20.2 Inches. 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 | 4.5 °F | 23.3 °F | 0.41 in. |
| February | 8.5 °F | 27.9 °F | 0.57 in. |
| March | 19.2 °F | 40.5 °F | 0.83 in. |
| April | 31.0 °F | 55.3 °F | 1.75 in. |
| May | 43.4 °F | 67.6 °F | 3.04 in. |
| June | 54.3 °F | 77.6 °F | 3.55 in. |
| July | 59.2 °F | 83.8 °F | 2.97 in. |
| August | 57.3 °F | 82.8 °F | 2.33 in. |
| September | 47.7 °F | 73.9 °F | 1.99 in. |
| October | 34.5 °F | 58.0 °F | 1.68 in. |
| November | 21.2 °F | 41.5 °F | 0.59 in. |
| December | 10.2 °F | 28.0 °F | 0.5 in. |
| Annual | 32.6 °F | 55 °F | 20.21 in. |
| 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 : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dwa - Humid Continental Hot Summers With Dry Winters |