Alliance, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 40.4 °F (low) to 59.5 °F (high). Annual precipitation averages 40.7 Inches. Alliance 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 | 18.8 °F | 33.8 °F | 2.94 in. |
| February | 19.7 °F | 36.6 °F | 2.26 in. |
| March | 27.7 °F | 46.2 °F | 3.15 in. |
| April | 38.4 °F | 59.6 °F | 3.71 in. |
| May | 48.4 °F | 69.9 °F | 3.96 in. |
| June | 57.9 °F | 78.9 °F | 4.35 in. |
| July | 61.7 °F | 82.7 °F | 4.3 in. |
| August | 59.7 °F | 80.6 °F | 3.5 in. |
| September | 53.0 °F | 74.5 °F | 3.55 in. |
| October | 42.0 °F | 63.0 °F | 3.18 in. |
| November | 32.7 °F | 49.7 °F | 2.9 in. |
| December | 24.5 °F | 38.8 °F | 2.9 in. |
| Annual | 40.4 °F | 59.5 °F | 40.7 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 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |