Parkville, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.1 °C (low) to 18.7 °C (high). Annual precipitation averages 1246.4 Millimeters. Parkville 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 | -3.5 °C | 5.8 °C | 88.39 mm |
| February | -2.7 °C | 7.4 °C | 74.93 mm |
| March | 1 °C | 12.1 °C | 111.76 mm |
| April | 6.9 °C | 18.7 °C | 97.03 mm |
| May | 12.3 °C | 23.7 °C | 110.24 mm |
| June | 17.4 °C | 28.4 °C | 110.74 mm |
| July | 20.3 °C | 30.8 °C | 115.57 mm |
| August | 19.2 °C | 29.8 °C | 108.2 mm |
| September | 15.5 °C | 26.1 °C | 122.94 mm |
| October | 8.9 °C | 19.8 °C | 115.32 mm |
| November | 3.1 °C | 13.6 °C | 86.87 mm |
| December | -0.9 °C | 8.1 °C | 104.39 mm |
| Annual | 8.1 °C | 18.7 °C | 1246.38 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 7b : -15°C to -12.2°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |