Smithsburg, Maryland has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 44.2 °F (low) to 63.7 °F (high). Annual precipitation averages 43.9 Inches. Smithsburg is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 24.0 °F | 39.6 °F | 3.19 in. |
| February | 25.1 °F | 43.1 °F | 2.44 in. |
| March | 32.3 °F | 51.2 °F | 3.64 in. |
| April | 42.3 °F | 64.2 °F | 3.89 in. |
| May | 51.8 °F | 73.1 °F | 4.27 in. |
| June | 60.8 °F | 81.7 °F | 4.0 in. |
| July | 65.0 °F | 86.0 °F | 3.99 in. |
| August | 63.3 °F | 84.3 °F | 3.66 in. |
| September | 56.3 °F | 77.4 °F | 4.37 in. |
| October | 45.7 °F | 65.9 °F | 3.74 in. |
| November | 35.6 °F | 53.9 °F | 3.17 in. |
| December | 28.1 °F | 43.5 °F | 3.5 in. |
| Annual | 44.2 °F | 63.7 °F | 43.86 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |