Joppatowne, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 47.7 °F (low) to 65.4 °F (high). Annual precipitation averages 49.4 Inches. Joppatowne is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 26.8 °F | 42.3 °F | 3.44 in. |
| February | 28.0 °F | 44.6 °F | 2.78 in. |
| March | 34.8 °F | 52.7 °F | 4.4 in. |
| April | 45.4 °F | 64.9 °F | 3.69 in. |
| May | 55.1 °F | 74.2 °F | 4.25 in. |
| June | 64.5 °F | 82.9 °F | 4.71 in. |
| July | 69.6 °F | 87.3 °F | 4.58 in. |
| August | 67.9 °F | 85.7 °F | 4.38 in. |
| September | 61.0 °F | 79.3 °F | 4.91 in. |
| October | 49.2 °F | 67.8 °F | 4.61 in. |
| November | 38.6 °F | 56.1 °F | 3.38 in. |
| December | 31.4 °F | 46.5 °F | 4.23 in. |
| Annual | 47.7 °F | 65.4 °F | 49.36 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |