Girdletree, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 48.5 °F (low) to 67.7 °F (high). Annual precipitation averages 46.8 Inches. Girdletree 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 Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 28.8 °F | 47.0 °F | 3.52 in. |
| February | 29.8 °F | 49.1 °F | 3.06 in. |
| March | 36.2 °F | 56.0 °F | 4.16 in. |
| April | 45.2 °F | 66.6 °F | 3.35 in. |
| May | 54.5 °F | 74.9 °F | 3.62 in. |
| June | 63.9 °F | 83.1 °F | 3.79 in. |
| July | 69.0 °F | 87.7 °F | 4.37 in. |
| August | 67.5 °F | 85.7 °F | 4.68 in. |
| September | 62.3 °F | 80.5 °F | 4.81 in. |
| October | 51.0 °F | 70.5 °F | 4.25 in. |
| November | 40.6 °F | 59.7 °F | 3.18 in. |
| December | 33.3 °F | 51.3 °F | 3.98 in. |
| Annual | 48.5 °F | 67.7 °F | 46.77 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 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |