Silver Spring, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.2 °C (low) to 19 °C (high). Annual precipitation averages 1161.8 Millimeters. Silver Spring is located in USDA Plant Hardiness Zone 7b. 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 | -3 °C | 6.2 °C | 79.25 mm |
| February | -2.2 °C | 8.1 °C | 69.6 mm |
| March | 1.4 °C | 12.9 °C | 101.09 mm |
| April | 6.9 °C | 19.4 °C | 87.88 mm |
| May | 12.4 °C | 24.1 °C | 113.79 mm |
| June | 17.3 °C | 28.6 °C | 116.84 mm |
| July | 19.9 °C | 30.8 °C | 114.81 mm |
| August | 19.1 °C | 29.8 °C | 94.49 mm |
| September | 15.4 °C | 26.1 °C | 112.52 mm |
| October | 8.9 °C | 19.8 °C | 97.54 mm |
| November | 3.2 °C | 13.8 °C | 79.5 mm |
| December | -0.7 °C | 8.4 °C | 94.49 mm |
| Annual | 8.2 °C | 19 °C | 1161.8 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |