Herman, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.8 °C (low) to 16.1 °C (high). Annual precipitation averages 785.4 Millimeters. Herman is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.1 °C | -0.4 °C | 16.76 mm |
| February | -9.1 °C | 2.2 °C | 21.59 mm |
| March | -2.9 °C | 9.5 °C | 42.42 mm |
| April | 3.2 °C | 16.8 °C | 87.88 mm |
| May | 10.2 °C | 22.7 °C | 111.25 mm |
| June | 16.2 °C | 28.3 °C | 118.36 mm |
| July | 18.2 °C | 30.1 °C | 80.01 mm |
| August | 16.6 °C | 28.9 °C | 96.27 mm |
| September | 11.4 °C | 25.6 °C | 89.15 mm |
| October | 4.3 °C | 18.2 °C | 58.17 mm |
| November | -2.7 °C | 9.7 °C | 35.56 mm |
| December | -8.4 °C | 1.9 °C | 27.94 mm |
| Annual | 3.8 °C | 16.1 °C | 785.36 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |