North Brentwood, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.7 °C (low) to 19.3 °C (high). Annual precipitation averages 1152.9 Millimeters. North Brentwood 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 Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.7 °C | 6.5 °C | 78.49 mm |
| February | -1.9 °C | 8.2 °C | 68.33 mm |
| March | 1.8 °C | 12.7 °C | 99.82 mm |
| April | 7.4 °C | 19.3 °C | 86.61 mm |
| May | 12.8 °C | 24.1 °C | 113.54 mm |
| June | 18.1 °C | 28.9 °C | 117.35 mm |
| July | 20.7 °C | 31.4 °C | 115.82 mm |
| August | 19.7 °C | 30.4 °C | 93.73 mm |
| September | 15.9 °C | 26.8 °C | 111 mm |
| October | 9.1 °C | 20.3 °C | 96.01 mm |
| November | 3.4 °C | 14.1 °C | 77.98 mm |
| December | -0.3 °C | 8.7 °C | 94.23 mm |
| Annual | 8.7 °C | 19.3 °C | 1152.91 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| 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 |