Crofton, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.5 °C (low) to 19 °C (high). Annual precipitation averages 1204.7 Millimeters. Crofton 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 Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.8 °C | 6.3 °C | 80.77 mm |
| February | -3 °C | 7.9 °C | 72.14 mm |
| March | 0.8 °C | 12.4 °C | 105.41 mm |
| April | 6.3 °C | 19.1 °C | 89.15 mm |
| May | 11.7 °C | 23.8 °C | 109.22 mm |
| June | 16.9 °C | 28.5 °C | 117.6 mm |
| July | 19.5 °C | 31 °C | 125.73 mm |
| August | 18.6 °C | 30.1 °C | 99.57 mm |
| September | 14.8 °C | 26.4 °C | 125.48 mm |
| October | 7.8 °C | 20.1 °C | 101.09 mm |
| November | 2.2 °C | 13.9 °C | 82.3 mm |
| December | -1.5 °C | 8.6 °C | 96.27 mm |
| Annual | 7.5 °C | 19 °C | 1204.73 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| 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 |