Portage, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.4 °C (low) to 15 °C (high). Annual precipitation averages 1153.7 Millimeters. Portage is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.9 °C | 1.3 °C | 85.09 mm |
| February | -7.3 °C | 3 °C | 73.91 mm |
| March | -3.6 °C | 7.8 °C | 94.49 mm |
| April | 2.2 °C | 15.4 °C | 97.54 mm |
| May | 8 °C | 20.8 °C | 110.74 mm |
| June | 12.7 °C | 25.2 °C | 110.24 mm |
| July | 14.8 °C | 27.3 °C | 109.98 mm |
| August | 13.9 °C | 26.6 °C | 103.89 mm |
| September | 10.2 °C | 23 °C | 105.16 mm |
| October | 4.2 °C | 16.4 °C | 88.39 mm |
| November | -1.2 °C | 9.6 °C | 82.3 mm |
| December | -5.1 °C | 3.7 °C | 91.95 mm |
| Annual | 3.4 °C | 15 °C | 1153.68 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |