Miller City, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.9 °F (low) to 60.3 °F (high). Annual precipitation averages 36.9 Inches. Miller City is located in USDA Plant Hardiness Zone 6a. 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 | 18.1 °F | 32.9 °F | 2.4 in. |
| February | 19.9 °F | 36.1 °F | 2.01 in. |
| March | 28.1 °F | 46.7 °F | 2.45 in. |
| April | 38.4 °F | 60.3 °F | 3.48 in. |
| May | 50.1 °F | 71.7 °F | 4.26 in. |
| June | 59.9 °F | 80.8 °F | 4.0 in. |
| July | 63.0 °F | 84.3 °F | 4.09 in. |
| August | 61.0 °F | 82.3 °F | 3.55 in. |
| September | 53.6 °F | 76.8 °F | 2.82 in. |
| October | 42.7 °F | 63.9 °F | 2.74 in. |
| November | 32.6 °F | 49.6 °F | 2.76 in. |
| December | 23.9 °F | 37.8 °F | 2.32 in. |
| Annual | 40.9 °F | 60.3 °F | 36.88 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 6a : -10°F to -5°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 |