Hamilton, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.9 °F (low) to 65.2 °F (high). Annual precipitation averages 42.1 Inches. Hamilton 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 22.7 °F | 39.6 °F | 3.16 in. |
| February | 24.8 °F | 43.7 °F | 2.51 in. |
| March | 32.4 °F | 53.5 °F | 3.67 in. |
| April | 42.5 °F | 66.1 °F | 4.42 in. |
| May | 53.0 °F | 75.5 °F | 4.51 in. |
| June | 62.0 °F | 83.4 °F | 4.45 in. |
| July | 65.3 °F | 86.7 °F | 3.87 in. |
| August | 63.7 °F | 86.1 °F | 3.11 in. |
| September | 55.4 °F | 80.2 °F | 2.91 in. |
| October | 43.8 °F | 68.3 °F | 3.18 in. |
| November | 33.5 °F | 54.8 °F | 3.07 in. |
| December | 27.6 °F | 43.9 °F | 3.26 in. |
| Annual | 43.9 °F | 65.2 °F | 42.12 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| 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 |