Shelby, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.4 °F (low) to 59.6 °F (high). Annual precipitation averages 41.2 Inches. Shelby 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 | 18.0 °F | 33.2 °F | 3.08 in. |
| February | 19.4 °F | 36.0 °F | 2.15 in. |
| March | 27.5 °F | 46.0 °F | 2.9 in. |
| April | 38.2 °F | 59.9 °F | 3.99 in. |
| May | 49.3 °F | 70.9 °F | 4.25 in. |
| June | 58.6 °F | 79.3 °F | 4.73 in. |
| July | 61.8 °F | 82.8 °F | 4.15 in. |
| August | 60.1 °F | 81.2 °F | 3.68 in. |
| September | 53.1 °F | 75.4 °F | 3.41 in. |
| October | 42.1 °F | 62.9 °F | 3.07 in. |
| November | 32.2 °F | 49.4 °F | 2.96 in. |
| December | 23.9 °F | 38.2 °F | 2.85 in. |
| Annual | 40.4 °F | 59.6 °F | 41.22 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 |