Forestburg, South Dakota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 35.1 °F (low) to 58.3 °F (high). Annual precipitation averages 24.1 Inches. Forestburg is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 7.1 °F | 26.8 °F | 0.52 in. |
| February | 11.1 °F | 32.6 °F | 0.61 in. |
| March | 22.2 °F | 44.5 °F | 1.09 in. |
| April | 33.8 °F | 59.3 °F | 2.85 in. |
| May | 46.6 °F | 70.8 °F | 3.46 in. |
| June | 57.5 °F | 80.7 °F | 3.86 in. |
| July | 61.7 °F | 86.0 °F | 2.89 in. |
| August | 59.5 °F | 84.3 °F | 2.94 in. |
| September | 50.4 °F | 76.5 °F | 2.44 in. |
| October | 36.4 °F | 61.9 °F | 2.05 in. |
| November | 23.3 °F | 45.1 °F | 0.85 in. |
| December | 12.0 °F | 31.2 °F | 0.56 in. |
| Annual | 35.1 °F | 58.3 °F | 24.12 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -25°F to -20°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 |