Hiram, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 39.6 °F (low) to 58.6 °F (high). Annual precipitation averages 43.4 Inches. Hiram is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 17.8 °F | 33.1 °F | 3.2 in. |
| February | 18.7 °F | 35.9 °F | 2.54 in. |
| March | 26.4 °F | 45.1 °F | 3.4 in. |
| April | 37.3 °F | 58.5 °F | 3.98 in. |
| May | 48.0 °F | 69.4 °F | 4.11 in. |
| June | 57.0 °F | 77.7 °F | 4.17 in. |
| July | 60.8 °F | 81.6 °F | 4.31 in. |
| August | 59.1 °F | 80.1 °F | 3.57 in. |
| September | 52.3 °F | 73.6 °F | 3.98 in. |
| October | 41.6 °F | 61.3 °F | 3.64 in. |
| November | 32.3 °F | 48.7 °F | 3.23 in. |
| December | 24.1 °F | 37.8 °F | 3.26 in. |
| Annual | 39.6 °F | 58.6 °F | 43.39 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |