Severna Park, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.6 °C (low) to 18.6 °C (high). Annual precipitation averages 1172.5 Millimeters. Severna Park is located in USDA Plant Hardiness Zone 8a. 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 | -2.2 °C | 6.2 °C | 80.52 mm |
| February | -1.5 °C | 7.4 °C | 70.1 mm |
| March | 2.3 °C | 11.7 °C | 106.93 mm |
| April | 8.2 °C | 18.4 °C | 88.39 mm |
| May | 13.6 °C | 23.3 °C | 107.44 mm |
| June | 18.9 °C | 28.3 °C | 114.3 mm |
| July | 21.7 °C | 30.7 °C | 112.52 mm |
| August | 20.9 °C | 29.7 °C | 101.35 mm |
| September | 17.3 °C | 26.1 °C | 115.57 mm |
| October | 10.7 °C | 19.8 °C | 99.31 mm |
| November | 4.8 °C | 13.6 °C | 79.25 mm |
| December | 0.4 °C | 8.5 °C | 96.77 mm |
| Annual | 9.6 °C | 18.6 °C | 1172.45 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 8a : -12.2°C to -9.4°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 |