Germantown, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.5 °F (low) to 63.6 °F (high). Annual precipitation averages 41.2 Inches. Germantown 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 | 21.6 °F | 37.7 °F | 3.13 in. |
| February | 23.6 °F | 41.5 °F | 2.37 in. |
| March | 31.7 °F | 51.6 °F | 3.41 in. |
| April | 42.0 °F | 64.3 °F | 4.31 in. |
| May | 53.0 °F | 74.2 °F | 4.63 in. |
| June | 61.8 °F | 82.4 °F | 4.48 in. |
| July | 65.2 °F | 85.7 °F | 3.81 in. |
| August | 63.2 °F | 84.9 °F | 2.99 in. |
| September | 55.5 °F | 79.0 °F | 2.97 in. |
| October | 43.7 °F | 66.9 °F | 2.99 in. |
| November | 33.7 °F | 53.2 °F | 2.92 in. |
| December | 26.6 °F | 42.1 °F | 3.2 in. |
| Annual | 43.5 °F | 63.6 °F | 41.21 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 |