Hermann, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 44.5 °F (low) to 66.2 °F (high). Annual precipitation averages 44 Inches. Hermann is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 21.7 °F | 40.1 °F | 2.34 in. |
| February | 24.8 °F | 45.4 °F | 2.3 in. |
| March | 33.6 °F | 55.8 °F | 3.16 in. |
| April | 43.8 °F | 67.5 °F | 4.69 in. |
| May | 54.4 °F | 75.8 °F | 5.31 in. |
| June | 63.2 °F | 83.9 °F | 4.54 in. |
| July | 67.5 °F | 88.2 °F | 4.03 in. |
| August | 65.1 °F | 87.1 °F | 4.22 in. |
| September | 56.5 °F | 80.8 °F | 4.0 in. |
| October | 44.0 °F | 69.2 °F | 3.4 in. |
| November | 33.9 °F | 56.1 °F | 3.37 in. |
| December | 25.3 °F | 44.4 °F | 2.64 in. |
| Annual | 44.5 °F | 66.2 °F | 44 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |