Jennings, Maryland has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.9 °F (low) to 58.2 °F (high). Annual precipitation averages 48 Inches. Jennings is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 17.7 °F | 34.3 °F | 3.73 in. |
| February | 19.3 °F | 37.6 °F | 3.5 in. |
| March | 25.6 °F | 45.9 °F | 4.13 in. |
| April | 35.5 °F | 59.9 °F | 4.3 in. |
| May | 45.9 °F | 68.5 °F | 5.07 in. |
| June | 54.4 °F | 75.6 °F | 5.02 in. |
| July | 58.2 °F | 79.3 °F | 4.34 in. |
| August | 56.7 °F | 78.0 °F | 3.79 in. |
| September | 49.8 °F | 71.9 °F | 3.78 in. |
| October | 39.2 °F | 60.6 °F | 3.29 in. |
| November | 29.6 °F | 48.5 °F | 3.22 in. |
| December | 22.9 °F | 38.4 °F | 3.84 in. |
| Annual | 37.9 °F | 58.2 °F | 48.01 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°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 |