Marcus Hook, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 8.5 °C (low) to 17.7 °C (high). Annual precipitation averages 1158.8 Millimeters. Marcus Hook is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.3 °C | 4.8 °C | 89.92 mm |
| February | -2.7 °C | 6.1 °C | 72.9 mm |
| March | 1.2 °C | 10.4 °C | 108.46 mm |
| April | 7 °C | 17.2 °C | 90.42 mm |
| May | 12.5 °C | 22.4 °C | 92.46 mm |
| June | 17.8 °C | 27.5 °C | 113.54 mm |
| July | 20.8 °C | 29.9 °C | 119.13 mm |
| August | 19.9 °C | 29.1 °C | 108.2 mm |
| September | 15.9 °C | 25.5 °C | 102.62 mm |
| October | 9.3 °C | 19 °C | 91.69 mm |
| November | 3.7 °C | 12.9 °C | 71.88 mm |
| December | -0.4 °C | 7.6 °C | 97.54 mm |
| Annual | 8.5 °C | 17.7 °C | 1158.76 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |