Jessup, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 38.1 °F (low) to 59 °F (high). Annual precipitation averages 43.8 Inches. Jessup 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 16.5 °F | 33.5 °F | 2.96 in. |
| February | 17.5 °F | 36.2 °F | 2.38 in. |
| March | 25.1 °F | 44.7 °F | 3.12 in. |
| April | 35.5 °F | 58.7 °F | 3.72 in. |
| May | 46.0 °F | 70.0 °F | 3.78 in. |
| June | 55.0 °F | 78.1 °F | 4.89 in. |
| July | 59.4 °F | 82.6 °F | 4.35 in. |
| August | 57.7 °F | 80.8 °F | 3.99 in. |
| September | 50.6 °F | 73.9 °F | 4.14 in. |
| October | 39.6 °F | 61.4 °F | 4.2 in. |
| November | 30.9 °F | 49.3 °F | 2.97 in. |
| December | 23.0 °F | 38.5 °F | 3.26 in. |
| Annual | 38.1 °F | 59 °F | 43.76 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |