Clinton, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.6 °C (low) to 19.1 °C (high). Annual precipitation averages 1159.5 Millimeters. 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 | -2.8 °C | 6.6 °C | 77.98 mm |
| February | -2 °C | 8.3 °C | 69.09 mm |
| March | 1.7 °C | 12.8 °C | 99.31 mm |
| April | 7.3 °C | 19.2 °C | 87.12 mm |
| May | 12.7 °C | 23.8 °C | 110.74 mm |
| June | 17.8 °C | 28.5 °C | 115.32 mm |
| July | 20.4 °C | 31 °C | 118.36 mm |
| August | 19.5 °C | 30 °C | 94.49 mm |
| September | 15.8 °C | 26.3 °C | 112.52 mm |
| October | 9.2 °C | 19.9 °C | 98.81 mm |
| November | 3.4 °C | 14.1 °C | 79.76 mm |
| December | -0.4 °C | 8.7 °C | 96.01 mm |
| Annual | 8.6 °C | 19.1 °C | 1159.51 mm |
| 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 : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |