White Rock, South Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.3 °F (low) to 52.9 °F (high). Annual precipitation averages 25.4 Inches. White Rock is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 0.7 °F | 19.2 °F | 0.7 in. |
| February | 4.2 °F | 23.6 °F | 0.65 in. |
| March | 18.4 °F | 36.6 °F | 1.09 in. |
| April | 32.0 °F | 53.9 °F | 2.15 in. |
| May | 45.3 °F | 68.1 °F | 3.05 in. |
| June | 56.4 °F | 77.6 °F | 4.17 in. |
| July | 60.3 °F | 82.0 °F | 3.88 in. |
| August | 57.1 °F | 80.2 °F | 2.86 in. |
| September | 48.2 °F | 72.4 °F | 2.71 in. |
| October | 35.3 °F | 57.1 °F | 2.42 in. |
| November | 21.6 °F | 39.5 °F | 0.94 in. |
| December | 8.2 °F | 25.1 °F | 0.78 in. |
| Annual | 32.3 °F | 52.9 °F | 25.4 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4a : -30°F to -25°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |