Tall Timbers, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.1 °C (low) to 19.3 °C (high). Annual precipitation averages 1166.6 Millimeters. Tall Timbers 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. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.3 °C | 7.3 °C | 82.8 mm |
| February | -0.6 °C | 8.6 °C | 71.63 mm |
| March | 3.1 °C | 12.4 °C | 103.89 mm |
| April | 8.7 °C | 18.9 °C | 85.85 mm |
| May | 14.2 °C | 23.7 °C | 98.04 mm |
| June | 19.1 °C | 28.4 °C | 106.68 mm |
| July | 21.8 °C | 30.6 °C | 117.35 mm |
| August | 20.9 °C | 29.5 °C | 108.71 mm |
| September | 17.6 °C | 26.5 °C | 107.95 mm |
| October | 11.2 °C | 20.7 °C | 107.95 mm |
| November | 5.3 °C | 14.5 °C | 82.3 mm |
| December | 1.3 °C | 9.9 °C | 93.47 mm |
| Annual | 10.1 °C | 19.3 °C | 1166.62 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |