Oglala, South Dakota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 1.5 °C (low) to 16.6 °C (high). Annual precipitation averages 467.1 Millimeters. Oglala 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 | -10.7 °C | 2.8 °C | 13.21 mm |
| February | -9.4 °C | 4.4 °C | 15.75 mm |
| March | -4.6 °C | 10.3 °C | 23.88 mm |
| April | 0.2 °C | 15.5 °C | 54.36 mm |
| May | 6.1 °C | 20.7 °C | 69.85 mm |
| June | 11.9 °C | 27.1 °C | 80.52 mm |
| July | 15.6 °C | 31.7 °C | 56.39 mm |
| August | 14.1 °C | 31.1 °C | 41.4 mm |
| September | 8.3 °C | 25.6 °C | 38.1 mm |
| October | 1.3 °C | 17.1 °C | 37.34 mm |
| November | -5.1 °C | 9.8 °C | 21.34 mm |
| December | -9.8 °C | 3.6 °C | 14.99 mm |
| Annual | 1.5 °C | 16.6 °C | 467.13 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 | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |