Duquesne, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.9 °C (low) to 16.9 °C (high). Annual precipitation averages 1046.5 Millimeters. Duquesne 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 | -5.6 °C | 3.3 °C | 80.52 mm |
| February | -4.9 °C | 4.7 °C | 62.23 mm |
| March | -1.2 °C | 9.9 °C | 85.09 mm |
| April | 4.4 °C | 17.3 °C | 86.11 mm |
| May | 10.3 °C | 22.7 °C | 97.03 mm |
| June | 15.2 °C | 27.1 °C | 112.78 mm |
| July | 17.6 °C | 29.3 °C | 108.2 mm |
| August | 16.9 °C | 28.6 °C | 93.98 mm |
| September | 13 °C | 24.9 °C | 88.39 mm |
| October | 6.7 °C | 18.2 °C | 78.99 mm |
| November | 1.3 °C | 11.4 °C | 74.93 mm |
| December | -2.7 °C | 5.7 °C | 78.23 mm |
| Annual | 5.9 °C | 16.9 °C | 1046.48 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 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |