Malvern, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 5.1 °C (low) to 16 °C (high). Annual precipitation averages 1054.3 Millimeters. Malvern 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.7 °C | 1.7 °C | 77.47 mm |
| February | -6.1 °C | 3.4 °C | 58.17 mm |
| March | -1.8 °C | 8.8 °C | 81.53 mm |
| April | 3.9 °C | 16.3 °C | 92.96 mm |
| May | 9.8 °C | 22 °C | 102.87 mm |
| June | 14.7 °C | 26.6 °C | 118.87 mm |
| July | 16.9 °C | 28.6 °C | 109.98 mm |
| August | 15.9 °C | 27.9 °C | 94.23 mm |
| September | 12.1 °C | 24.4 °C | 89.66 mm |
| October | 5.9 °C | 17.8 °C | 80.01 mm |
| November | 0.7 °C | 10.4 °C | 73.15 mm |
| December | -3.6 °C | 4.4 °C | 75.44 mm |
| Annual | 5.1 °C | 16 °C | 1054.34 mm |
| 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 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |