Oglala, South Dakota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 34.7 °F (low) to 61.9 °F (high). Annual precipitation averages 18.4 Inches. 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 | 12.8 °F | 37.0 °F | 0.52 in. |
| February | 15.1 °F | 40.0 °F | 0.62 in. |
| March | 23.7 °F | 50.5 °F | 0.94 in. |
| April | 32.4 °F | 59.9 °F | 2.14 in. |
| May | 43.0 °F | 69.2 °F | 2.75 in. |
| June | 53.4 °F | 80.8 °F | 3.17 in. |
| July | 60.1 °F | 89.0 °F | 2.22 in. |
| August | 57.4 °F | 87.9 °F | 1.63 in. |
| September | 46.9 °F | 78.1 °F | 1.5 in. |
| October | 34.3 °F | 62.7 °F | 1.47 in. |
| November | 22.8 °F | 49.7 °F | 0.84 in. |
| December | 14.3 °F | 38.4 °F | 0.59 in. |
| Annual | 34.7 °F | 61.9 °F | 18.39 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |