Clinton, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 47.4 °F (low) to 66.4 °F (high). Annual precipitation averages 45.7 Inches. Clinton 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 | 26.9 °F | 43.9 °F | 3.07 in. |
| February | 28.4 °F | 46.9 °F | 2.72 in. |
| March | 35.1 °F | 55.1 °F | 3.91 in. |
| April | 45.2 °F | 66.5 °F | 3.43 in. |
| May | 54.9 °F | 74.9 °F | 4.36 in. |
| June | 64.0 °F | 83.3 °F | 4.54 in. |
| July | 68.8 °F | 87.8 °F | 4.66 in. |
| August | 67.1 °F | 86.0 °F | 3.72 in. |
| September | 60.4 °F | 79.4 °F | 4.43 in. |
| October | 48.5 °F | 67.9 °F | 3.89 in. |
| November | 38.2 °F | 57.3 °F | 3.14 in. |
| December | 31.2 °F | 47.7 °F | 3.78 in. |
| Annual | 47.4 °F | 66.4 °F | 45.65 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 | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |