Glen Burnie, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.9 °C (low) to 18.8 °C (high). Annual precipitation averages 1190.8 Millimeters. Glen Burnie 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 | -2.7 °C | 6.2 °C | 82.55 mm |
| February | -1.8 °C | 7.5 °C | 74.42 mm |
| March | 1.9 °C | 12 °C | 108.46 mm |
| April | 7.7 °C | 18.7 °C | 91.19 mm |
| May | 13.1 °C | 23.6 °C | 106.93 mm |
| June | 18.2 °C | 28.6 °C | 110.24 mm |
| July | 21 °C | 31 °C | 114.3 mm |
| August | 20.1 °C | 29.9 °C | 102.11 mm |
| September | 16.3 °C | 26.3 °C | 114.81 mm |
| October | 9.7 °C | 19.9 °C | 102.87 mm |
| November | 3.9 °C | 13.8 °C | 82.3 mm |
| December | -0.2 °C | 8.5 °C | 100.58 mm |
| Annual | 8.9 °C | 18.8 °C | 1190.76 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 |