Hamden, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.5 °F (low) to 64.6 °F (high). Annual precipitation averages 44.3 Inches. Hamden is located in USDA Plant Hardiness Zone 6b. 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 | 21.9 °F | 39.6 °F | 3.36 in. |
| February | 23.8 °F | 43.5 °F | 3.09 in. |
| March | 30.8 °F | 53.3 °F | 4.06 in. |
| April | 41.0 °F | 66.5 °F | 4.09 in. |
| May | 51.3 °F | 74.9 °F | 4.5 in. |
| June | 59.9 °F | 82.6 °F | 4.36 in. |
| July | 63.7 °F | 85.7 °F | 4.47 in. |
| August | 61.8 °F | 84.7 °F | 3.38 in. |
| September | 54.4 °F | 79.0 °F | 3.44 in. |
| October | 42.3 °F | 67.2 °F | 3.14 in. |
| November | 32.7 °F | 54.6 °F | 3.03 in. |
| December | 26.8 °F | 43.9 °F | 3.37 in. |
| Annual | 42.5 °F | 64.6 °F | 44.29 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 |