McIntosh, South Dakota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 32.2 °F (low) to 56.3 °F (high). Annual precipitation averages 17.5 Inches. 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 | 6.4 °F | 26.0 °F | 0.39 in. |
| February | 10.1 °F | 29.9 °F | 0.5 in. |
| March | 19.8 °F | 42.0 °F | 0.74 in. |
| April | 30.7 °F | 56.0 °F | 1.41 in. |
| May | 42.3 °F | 67.5 °F | 2.62 in. |
| June | 52.5 °F | 77.5 °F | 3.2 in. |
| July | 58.0 °F | 85.2 °F | 2.83 in. |
| August | 56.0 °F | 84.7 °F | 1.84 in. |
| September | 46.4 °F | 75.2 °F | 1.49 in. |
| October | 33.5 °F | 58.5 °F | 1.5 in. |
| November | 20.6 °F | 42.5 °F | 0.54 in. |
| December | 10.3 °F | 30.3 °F | 0.45 in. |
| Annual | 32.2 °F | 56.3 °F | 17.51 in. |
| 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 : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |