Lusby, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.1 °C (low) to 19.2 °C (high). Annual precipitation averages 1166.1 Millimeters. Lusby is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.4 °C | 7.2 °C | 80.52 mm |
| February | -0.8 °C | 8.6 °C | 73.66 mm |
| March | 2.8 °C | 12.4 °C | 109.22 mm |
| April | 8.5 °C | 18.7 °C | 83.82 mm |
| May | 14.2 °C | 23.5 °C | 98.81 mm |
| June | 19.1 °C | 28.3 °C | 108.2 mm |
| July | 21.8 °C | 30.6 °C | 114.05 mm |
| August | 20.9 °C | 29.6 °C | 112.78 mm |
| September | 17.7 °C | 26.4 °C | 108.97 mm |
| October | 11.2 °C | 20.4 °C | 101.6 mm |
| November | 5.2 °C | 14.5 °C | 80.01 mm |
| December | 1.4 °C | 9.8 °C | 94.49 mm |
| Annual | 10.1 °C | 19.2 °C | 1166.13 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 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 |