Humboldt, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -2 °C (low) to 9.2 °C (high). Annual precipitation averages 579.1 Millimeters. Humboldt is located in USDA Plant Hardiness Zone 3b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -20.2 °C | -10.7 °C | 18.29 mm |
| February | -18.6 °C | -8.1 °C | 16.26 mm |
| March | -10.6 °C | -0.7 °C | 22.1 mm |
| April | -1.6 °C | 9.9 °C | 27.43 mm |
| May | 5.4 °C | 18.2 °C | 82.3 mm |
| June | 11.8 °C | 23.5 °C | 103.12 mm |
| July | 13.8 °C | 26.1 °C | 88.65 mm |
| August | 12.1 °C | 25.7 °C | 66.8 mm |
| September | 7.3 °C | 20.7 °C | 60.71 mm |
| October | 0.5 °C | 11.5 °C | 42.67 mm |
| November | -7.7 °C | 1.1 °C | 26.92 mm |
| December | -15.8 °C | -7.2 °C | 23.88 mm |
| Annual | -2 °C | 9.2 °C | 579.13 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 3b : -37.2°C to -34.4°C |
| Plant Hardiness Zone - 2012 | Zone 3b : -37.2°C to -34.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |