Jerome, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.8 °C (low) to 14.6 °C (high). Annual precipitation averages 1140.5 Millimeters. Jerome is located in USDA Plant Hardiness Zone 6a. 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 | -7.9 °C | 1.2 °C | 85.6 mm |
| February | -7.2 °C | 2.7 °C | 69.09 mm |
| March | -3.5 °C | 7.6 °C | 97.28 mm |
| April | 2.9 °C | 15 °C | 97.54 mm |
| May | 8.4 °C | 20.4 °C | 118.62 mm |
| June | 13.1 °C | 24.4 °C | 112.52 mm |
| July | 15.3 °C | 26.6 °C | 106.43 mm |
| August | 14.4 °C | 25.9 °C | 101.85 mm |
| September | 10.6 °C | 22.4 °C | 96.77 mm |
| October | 4.7 °C | 15.9 °C | 84.07 mm |
| November | -0.7 °C | 9.4 °C | 83.57 mm |
| December | -4.6 °C | 3.6 °C | 87.12 mm |
| Annual | 3.8 °C | 14.6 °C | 1140.46 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°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 |