Rosedale, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 49.2 °F (low) to 65.7 °F (high). Annual precipitation averages 48.2 Inches. Rosedale is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 28.1 °F | 42.7 °F | 3.43 in. |
| February | 29.4 °F | 44.9 °F | 2.9 in. |
| March | 36.3 °F | 53.0 °F | 4.35 in. |
| April | 46.9 °F | 65.0 °F | 3.75 in. |
| May | 56.6 °F | 74.2 °F | 4.27 in. |
| June | 66.1 °F | 83.4 °F | 4.44 in. |
| July | 71.1 °F | 87.9 °F | 4.43 in. |
| August | 69.4 °F | 86.0 °F | 4.11 in. |
| September | 62.6 °F | 79.4 °F | 4.73 in. |
| October | 50.7 °F | 67.8 °F | 4.41 in. |
| November | 40.1 °F | 56.5 °F | 3.35 in. |
| December | 32.6 °F | 47.0 °F | 4.02 in. |
| Annual | 49.2 °F | 65.7 °F | 48.19 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |