Humboldt, South Dakota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 34.3 °F (low) to 55.1 °F (high). Annual precipitation averages 27.2 Inches. 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 | 5.8 °F | 23.9 °F | 0.57 in. |
| February | 10.0 °F | 28.8 °F | 0.77 in. |
| March | 21.1 °F | 41.1 °F | 1.32 in. |
| April | 33.3 °F | 55.5 °F | 2.93 in. |
| May | 45.8 °F | 67.9 °F | 3.74 in. |
| June | 56.7 °F | 77.9 °F | 4.17 in. |
| July | 60.9 °F | 82.9 °F | 3.3 in. |
| August | 58.3 °F | 80.0 °F | 3.34 in. |
| September | 49.4 °F | 73.2 °F | 2.94 in. |
| October | 36.0 °F | 59.3 °F | 2.24 in. |
| November | 22.4 °F | 42.4 °F | 1.04 in. |
| December | 11.3 °F | 28.8 °F | 0.79 in. |
| Annual | 34.3 °F | 55.1 °F | 27.15 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 | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |