Delmont, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.8 °C (low) to 16.1 °C (high). Annual precipitation averages 1133.4 Millimeters. Delmont is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.7 °C | 2.5 °C | 83.82 mm |
| February | -6.1 °C | 4.2 °C | 67.31 mm |
| March | -2.1 °C | 9.1 °C | 85.85 mm |
| April | 3.6 °C | 16.3 °C | 97.03 mm |
| May | 9.5 °C | 21.8 °C | 106.93 mm |
| June | 14.1 °C | 26.1 °C | 116.33 mm |
| July | 16.4 °C | 28.2 °C | 119.38 mm |
| August | 15.4 °C | 27.6 °C | 104.9 mm |
| September | 11.6 °C | 23.9 °C | 99.06 mm |
| October | 5.3 °C | 17.4 °C | 83.06 mm |
| November | 0.1 °C | 10.6 °C | 84.84 mm |
| December | -3.6 °C | 4.9 °C | 84.84 mm |
| Annual | 4.8 °C | 16.1 °C | 1133.35 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |