Rowena, South Dakota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 35.3 °F (low) to 56.4 °F (high). Annual precipitation averages 28.8 Inches. Rowena 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 | 6.7 °F | 25.1 °F | 0.71 in. |
| February | 11.1 °F | 30.0 °F | 0.88 in. |
| March | 22.6 °F | 42.5 °F | 1.54 in. |
| April | 34.1 °F | 57.1 °F | 2.91 in. |
| May | 46.9 °F | 69.3 °F | 3.76 in. |
| June | 58.2 °F | 79.5 °F | 4.72 in. |
| July | 62.0 °F | 83.6 °F | 3.35 in. |
| August | 59.2 °F | 81.2 °F | 3.31 in. |
| September | 50.1 °F | 74.4 °F | 2.9 in. |
| October | 36.8 °F | 60.4 °F | 2.37 in. |
| November | 23.4 °F | 43.8 °F | 1.36 in. |
| December | 12.3 °F | 29.8 °F | 0.96 in. |
| Annual | 35.3 °F | 56.4 °F | 28.77 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 |