Inkerman, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.6 °C (low) to 15.7 °C (high). Annual precipitation averages 1079 Millimeters. Inkerman 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 | -7.4 °C | 1.6 °C | 68.33 mm |
| February | -6.8 °C | 3.2 °C | 60.2 mm |
| March | -2.6 °C | 8 °C | 70.61 mm |
| April | 3.3 °C | 15.4 °C | 91.69 mm |
| May | 9.2 °C | 21.8 °C | 87.88 mm |
| June | 14.1 °C | 26.2 °C | 115.57 mm |
| July | 16.5 °C | 28.8 °C | 112.01 mm |
| August | 15.6 °C | 27.7 °C | 100.33 mm |
| September | 11.6 °C | 23.9 °C | 111.51 mm |
| October | 5.5 °C | 17 °C | 107.44 mm |
| November | 0.4 °C | 10.5 °C | 73.66 mm |
| December | -3.9 °C | 4.6 °C | 79.76 mm |
| Annual | 4.6 °C | 15.7 °C | 1078.99 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 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |