Herbster, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.6 °F (low) to 50 °F (high). Annual precipitation averages 30.1 Inches. Herbster is located in USDA Plant Hardiness Zone 5a. 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 | 6.8 °F | 22.7 °F | 1.1 in. |
| February | 8.6 °F | 26.9 °F | 1.09 in. |
| March | 18.4 °F | 36.2 °F | 1.65 in. |
| April | 29.8 °F | 46.8 °F | 2.81 in. |
| May | 38.9 °F | 59.1 °F | 3.16 in. |
| June | 47.6 °F | 68.2 °F | 3.69 in. |
| July | 56.1 °F | 75.7 °F | 3.86 in. |
| August | 56.3 °F | 75.1 °F | 3.23 in. |
| September | 49.4 °F | 67.4 °F | 3.11 in. |
| October | 38.3 °F | 53.7 °F | 2.82 in. |
| November | 26.7 °F | 39.8 °F | 1.92 in. |
| December | 14.7 °F | 27.9 °F | 1.64 in. |
| Annual | 32.6 °F | 50 °F | 30.08 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |