Jeannette, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.9 °C (low) to 16.5 °C (high). Annual precipitation averages 1111.5 Millimeters. Jeannette 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 | -6.3 °C | 3 °C | 82.8 mm |
| February | -5.9 °C | 4.5 °C | 68.83 mm |
| March | -2 °C | 9.6 °C | 85.85 mm |
| April | 3.5 °C | 16.8 °C | 92.46 mm |
| May | 9.3 °C | 22.2 °C | 105.92 mm |
| June | 14.2 °C | 26.6 °C | 115.06 mm |
| July | 16.5 °C | 28.7 °C | 116.59 mm |
| August | 15.7 °C | 28.1 °C | 100.33 mm |
| September | 11.7 °C | 24.6 °C | 96.52 mm |
| October | 5.4 °C | 17.8 °C | 82.55 mm |
| November | 0.1 °C | 11 °C | 82.04 mm |
| December | -3.5 °C | 5.3 °C | 82.55 mm |
| Annual | 4.9 °C | 16.5 °C | 1111.5 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 |