Monaca, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.4 °C (low) to 16.3 °C (high). Annual precipitation averages 1021.8 Millimeters. Monaca 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 | -6.1 °C | 2.6 °C | 79.5 mm |
| February | -5.6 °C | 4.1 °C | 60.2 mm |
| March | -1.6 °C | 9.2 °C | 78.74 mm |
| April | 3.9 °C | 16.7 °C | 91.95 mm |
| May | 9.7 °C | 22.2 °C | 96.77 mm |
| June | 14.6 °C | 26.6 °C | 107.44 mm |
| July | 16.9 °C | 28.7 °C | 102.11 mm |
| August | 16.2 °C | 27.9 °C | 86.36 mm |
| September | 12.4 °C | 24.4 °C | 90.42 mm |
| October | 6.3 °C | 17.7 °C | 76.45 mm |
| November | 1 °C | 10.8 °C | 73.66 mm |
| December | -3.1 °C | 4.9 °C | 78.23 mm |
| Annual | 5.4 °C | 16.3 °C | 1021.83 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 |