Parkville, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.6 °F (low) to 65.6 °F (high). Annual precipitation averages 49.1 Inches. 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 | 25.7 °F | 42.5 °F | 3.48 in. |
| February | 27.1 °F | 45.3 °F | 2.95 in. |
| March | 33.8 °F | 53.7 °F | 4.4 in. |
| April | 44.4 °F | 65.6 °F | 3.82 in. |
| May | 54.1 °F | 74.6 °F | 4.34 in. |
| June | 63.4 °F | 83.2 °F | 4.36 in. |
| July | 68.5 °F | 87.5 °F | 4.55 in. |
| August | 66.5 °F | 85.7 °F | 4.26 in. |
| September | 59.9 °F | 79.0 °F | 4.84 in. |
| October | 48.0 °F | 67.6 °F | 4.54 in. |
| November | 37.6 °F | 56.4 °F | 3.42 in. |
| December | 30.3 °F | 46.6 °F | 4.11 in. |
| Annual | 46.6 °F | 65.6 °F | 49.07 in. |
| 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 : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |