Barclay, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 45.4 °F (low) to 65.6 °F (high). Annual precipitation averages 46.4 Inches. Barclay 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 | 25.0 °F | 43.1 °F | 3.35 in. |
| February | 26.0 °F | 45.2 °F | 2.96 in. |
| March | 33.2 °F | 53.2 °F | 4.1 in. |
| April | 43.3 °F | 64.9 °F | 3.58 in. |
| May | 52.9 °F | 73.9 °F | 4.01 in. |
| June | 62.0 °F | 82.6 °F | 4.57 in. |
| July | 67.0 °F | 87.0 °F | 4.35 in. |
| August | 65.0 °F | 85.2 °F | 4.25 in. |
| September | 58.3 °F | 79.5 °F | 4.25 in. |
| October | 46.3 °F | 68.1 °F | 3.96 in. |
| November | 36.3 °F | 57.1 °F | 3.14 in. |
| December | 29.6 °F | 47.4 °F | 3.87 in. |
| Annual | 45.4 °F | 65.6 °F | 46.39 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 7a : 0°F to 5°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |