McIntosh, South Dakota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 0.1 °C (low) to 13.5 °C (high). Annual precipitation averages 444.8 Millimeters. McIntosh is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -14.2 °C | -3.3 °C | 9.91 mm |
| February | -12.2 °C | -1.2 °C | 12.7 mm |
| March | -6.8 °C | 5.6 °C | 18.8 mm |
| April | -0.7 °C | 13.3 °C | 35.81 mm |
| May | 5.7 °C | 19.7 °C | 66.55 mm |
| June | 11.4 °C | 25.3 °C | 81.28 mm |
| July | 14.4 °C | 29.6 °C | 71.88 mm |
| August | 13.3 °C | 29.3 °C | 46.74 mm |
| September | 8 °C | 24 °C | 37.85 mm |
| October | 0.8 °C | 14.7 °C | 38.1 mm |
| November | -6.3 °C | 5.8 °C | 13.72 mm |
| December | -12.1 °C | -0.9 °C | 11.43 mm |
| Annual | 0.1 °C | 13.5 °C | 444.77 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| 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 | Dfa - Humid Continental Hot Summers With Year Around Precipitation |