Jennerstown, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 38 °F (low) to 57.5 °F (high). Annual precipitation averages 47 Inches. Jennerstown 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. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 16.7 °F | 33.6 °F | 3.56 in. |
| February | 18.5 °F | 36.2 °F | 2.93 in. |
| March | 24.9 °F | 44.8 °F | 4.04 in. |
| April | 36.5 °F | 58.2 °F | 4.05 in. |
| May | 46.3 °F | 67.9 °F | 4.74 in. |
| June | 54.8 °F | 75.1 °F | 4.73 in. |
| July | 58.8 °F | 78.9 °F | 4.36 in. |
| August | 57.2 °F | 77.8 °F | 4.13 in. |
| September | 50.0 °F | 71.4 °F | 3.96 in. |
| October | 39.7 °F | 60.0 °F | 3.47 in. |
| November | 30.0 °F | 48.2 °F | 3.43 in. |
| December | 23.1 °F | 38.0 °F | 3.63 in. |
| Annual | 38 °F | 57.5 °F | 47.03 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |