Humboldt, South Dakota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 1.3 °C (low) to 12.9 °C (high). Annual precipitation averages 689.6 Millimeters. Humboldt 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 | -14.6 °C | -4.5 °C | 14.48 mm |
| February | -12.2 °C | -1.8 °C | 19.56 mm |
| March | -6.1 °C | 5.1 °C | 33.53 mm |
| April | 0.7 °C | 13.1 °C | 74.42 mm |
| May | 7.7 °C | 19.9 °C | 95 mm |
| June | 13.7 °C | 25.5 °C | 105.92 mm |
| July | 16.1 °C | 28.3 °C | 83.82 mm |
| August | 14.6 °C | 26.7 °C | 84.84 mm |
| September | 9.7 °C | 22.9 °C | 74.68 mm |
| October | 2.2 °C | 15.2 °C | 56.9 mm |
| November | -5.3 °C | 5.8 °C | 26.42 mm |
| December | -11.5 °C | -1.8 °C | 20.07 mm |
| Annual | 1.3 °C | 12.9 °C | 689.64 mm |
| 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 : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |