Herman, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 38.9 °F (low) to 61 °F (high). Annual precipitation averages 30.9 Inches. 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 | 12.0 °F | 31.3 °F | 0.66 in. |
| February | 15.7 °F | 35.9 °F | 0.85 in. |
| March | 26.7 °F | 49.1 °F | 1.67 in. |
| April | 37.8 °F | 62.3 °F | 3.46 in. |
| May | 50.3 °F | 72.8 °F | 4.38 in. |
| June | 61.1 °F | 82.9 °F | 4.66 in. |
| July | 64.7 °F | 86.2 °F | 3.15 in. |
| August | 61.9 °F | 84.0 °F | 3.79 in. |
| September | 52.6 °F | 78.0 °F | 3.51 in. |
| October | 39.7 °F | 64.8 °F | 2.29 in. |
| November | 27.1 °F | 49.4 °F | 1.4 in. |
| December | 16.8 °F | 35.5 °F | 1.1 in. |
| Annual | 38.9 °F | 61 °F | 30.92 in. |
| 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 : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |