Oacoma, South Dakota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 35.9 °F (low) to 59.9 °F (high). Annual precipitation averages 22.5 Inches. Oacoma 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 | 8.8 °F | 30.0 °F | 0.55 in. |
| February | 12.3 °F | 34.8 °F | 0.63 in. |
| March | 22.2 °F | 46.8 °F | 0.96 in. |
| April | 33.8 °F | 59.7 °F | 2.64 in. |
| May | 46.5 °F | 70.9 °F | 3.39 in. |
| June | 57.4 °F | 81.6 °F | 3.8 in. |
| July | 63.0 °F | 88.3 °F | 2.69 in. |
| August | 60.4 °F | 85.9 °F | 2.34 in. |
| September | 51.2 °F | 77.5 °F | 2.27 in. |
| October | 37.4 °F | 63.5 °F | 1.78 in. |
| November | 24.0 °F | 46.3 °F | 0.78 in. |
| December | 13.7 °F | 33.2 °F | 0.63 in. |
| Annual | 35.9 °F | 59.9 °F | 22.46 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 |