Hemlock, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.3 °F (low) to 62.6 °F (high). Annual precipitation averages 42.7 Inches. Hemlock 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 | 19.3 °F | 37.7 °F | 3.21 in. |
| February | 21.0 °F | 41.0 °F | 2.7 in. |
| March | 28.4 °F | 51.0 °F | 3.69 in. |
| April | 38.4 °F | 64.3 °F | 3.88 in. |
| May | 48.8 °F | 72.8 °F | 4.26 in. |
| June | 57.8 °F | 80.7 °F | 4.62 in. |
| July | 61.8 °F | 84.0 °F | 4.32 in. |
| August | 60.0 °F | 83.2 °F | 3.48 in. |
| September | 52.3 °F | 76.6 °F | 3.39 in. |
| October | 40.5 °F | 65.0 °F | 3.0 in. |
| November | 31.1 °F | 53.1 °F | 2.99 in. |
| December | 24.7 °F | 42.3 °F | 3.16 in. |
| Annual | 40.3 °F | 62.6 °F | 42.7 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 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |