Brunswick, Maryland has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.8 °C (low) to 18.6 °C (high). Annual precipitation averages 1067.8 Millimeters. Brunswick is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.4 °C | 5.3 °C | 76.45 mm |
| February | -3.6 °C | 7.2 °C | 60.71 mm |
| March | 0.1 °C | 12 °C | 89.92 mm |
| April | 5.7 °C | 18.9 °C | 85.09 mm |
| May | 11.2 °C | 23.8 °C | 108.2 mm |
| June | 16.2 °C | 28.4 °C | 99.57 mm |
| July | 18.7 °C | 30.9 °C | 102.62 mm |
| August | 17.6 °C | 29.8 °C | 81.53 mm |
| September | 13.7 °C | 26.2 °C | 112.78 mm |
| October | 7.3 °C | 20 °C | 86.61 mm |
| November | 1.6 °C | 13.3 °C | 77.47 mm |
| December | -2.1 °C | 7.6 °C | 86.87 mm |
| Annual | 6.8 °C | 18.6 °C | 1067.82 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |