Portage Lakes, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 5.3 °C (low) to 15.4 °C (high). Annual precipitation averages 994.2 Millimeters. Portage Lakes 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 | -6.8 °C | 1.1 °C | 70.61 mm |
| February | -6.2 °C | 2.6 °C | 54.86 mm |
| March | -1.9 °C | 7.9 °C | 77.98 mm |
| April | 4.2 °C | 15.4 °C | 91.19 mm |
| May | 10 °C | 21.3 °C | 97.28 mm |
| June | 15 °C | 26.1 °C | 103.38 mm |
| July | 17.1 °C | 28.3 °C | 97.79 mm |
| August | 16.1 °C | 27.4 °C | 89.66 mm |
| September | 12.2 °C | 23.8 °C | 83.57 mm |
| October | 6.3 °C | 16.9 °C | 81.53 mm |
| November | 0.9 °C | 9.8 °C | 74.68 mm |
| December | -3.5 °C | 3.7 °C | 71.63 mm |
| Annual | 5.3 °C | 15.4 °C | 994.16 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 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |