Tallmadge, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 5.1 °C (low) to 15.1 °C (high). Annual precipitation averages 1004.6 Millimeters. Tallmadge is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.1 °C | 0.9 °C | 69.6 mm |
| February | -6.5 °C | 2.4 °C | 54.86 mm |
| March | -2.2 °C | 7.6 °C | 77.98 mm |
| April | 3.9 °C | 15.2 °C | 91.69 mm |
| May | 9.7 °C | 21.2 °C | 99.31 mm |
| June | 14.9 °C | 25.8 °C | 103.89 mm |
| July | 16.9 °C | 28.1 °C | 100.84 mm |
| August | 16 °C | 27.2 °C | 89.92 mm |
| September | 12.1 °C | 23.5 °C | 87.12 mm |
| October | 6.2 °C | 16.6 °C | 82.3 mm |
| November | 0.8 °C | 9.6 °C | 74.68 mm |
| December | -3.7 °C | 3.5 °C | 72.39 mm |
| Annual | 5.1 °C | 15.1 °C | 1004.58 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |