Ellerslie, Maryland has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.7 °F (low) to 65.1 °F (high). Annual precipitation averages 39.8 Inches. Ellerslie is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 23.6 °F | 40.2 °F | 2.56 in. |
| February | 24.9 °F | 44.0 °F | 2.54 in. |
| March | 31.4 °F | 52.7 °F | 3.53 in. |
| April | 40.6 °F | 66.7 °F | 3.49 in. |
| May | 50.0 °F | 75.5 °F | 4.48 in. |
| June | 58.9 °F | 83.0 °F | 4.21 in. |
| July | 63.0 °F | 87.4 °F | 3.43 in. |
| August | 61.4 °F | 85.8 °F | 3.23 in. |
| September | 54.6 °F | 79.3 °F | 3.56 in. |
| October | 43.1 °F | 67.5 °F | 2.97 in. |
| November | 33.7 °F | 54.6 °F | 2.74 in. |
| December | 27.6 °F | 44.2 °F | 3.09 in. |
| Annual | 42.7 °F | 65.1 °F | 39.83 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |