Brandon, South Dakota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2 °C (low) to 13.6 °C (high). Annual precipitation averages 726.9 Millimeters. Brandon is located in USDA Plant Hardiness Zone 5a. 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 | -13.9 °C | -3.8 °C | 18.03 mm |
| February | -11.6 °C | -1.2 °C | 22.61 mm |
| March | -5.2 °C | 5.8 °C | 38.61 mm |
| April | 1.3 °C | 13.9 °C | 73.91 mm |
| May | 8.4 °C | 20.7 °C | 94.74 mm |
| June | 14.7 °C | 26.4 °C | 117.09 mm |
| July | 16.7 °C | 28.8 °C | 85.09 mm |
| August | 15.3 °C | 27.4 °C | 84.07 mm |
| September | 10.3 °C | 23.6 °C | 74.93 mm |
| October | 2.8 °C | 15.8 °C | 59.69 mm |
| November | -4.6 °C | 6.6 °C | 33.78 mm |
| December | -10.8 °C | -1.2 °C | 24.38 mm |
| Annual | 2 °C | 13.6 °C | 726.93 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 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |