Brookings, South Dakota has a Humid Continental Hot Summers With Dry Winters climate (Köppen classification: Dwa). Average annual temperatures range from 0.6 °C (low) to 12.1 °C (high). Annual precipitation averages 651.8 Millimeters. Brookings 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 | -15.4 °C | -5.2 °C | 12.95 mm |
| February | -13.5 °C | -2.7 °C | 14.73 mm |
| March | -6.8 °C | 4.1 °C | 30.23 mm |
| April | 0 °C | 12.2 °C | 56.39 mm |
| May | 7.3 °C | 19.2 °C | 86.61 mm |
| June | 13.6 °C | 24.8 °C | 107.44 mm |
| July | 15.7 °C | 27.4 °C | 92.2 mm |
| August | 13.9 °C | 26.1 °C | 82.04 mm |
| September | 9.1 °C | 22.1 °C | 75.44 mm |
| October | 1.4 °C | 14.2 °C | 52.32 mm |
| November | -5.8 °C | 5.2 °C | 23.11 mm |
| December | -12.1 °C | -2.4 °C | 18.29 mm |
| Annual | 0.6 °C | 12.1 °C | 651.75 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 |