Baltimore Highlands, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.1 °C (low) to 18.9 °C (high). Annual precipitation averages 1196.6 Millimeters. Baltimore Highlands 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 | -2.4 °C | 6.2 °C | 84.33 mm |
| February | -1.7 °C | 7.5 °C | 74.68 mm |
| March | 2.2 °C | 12.1 °C | 108.97 mm |
| April | 7.8 °C | 18.6 °C | 92.96 mm |
| May | 13.2 °C | 23.6 °C | 104.9 mm |
| June | 18.3 °C | 28.7 °C | 112.27 mm |
| July | 21.1 °C | 31.2 °C | 109.98 mm |
| August | 20.1 °C | 30.1 °C | 101.6 mm |
| September | 16.3 °C | 26.4 °C | 116.59 mm |
| October | 9.7 °C | 20 °C | 105.66 mm |
| November | 4.1 °C | 13.9 °C | 83.57 mm |
| December | 0 °C | 8.6 °C | 101.09 mm |
| Annual | 9.1 °C | 18.9 °C | 1196.6 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |