Swanton, Maryland has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.8 °C (low) to 14.4 °C (high). Annual precipitation averages 1292.9 Millimeters. Swanton is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.5 °C | 1.3 °C | 106.93 mm |
| February | -6.5 °C | 3.3 °C | 99.82 mm |
| March | -3 °C | 7.8 °C | 113.54 mm |
| April | 2.6 °C | 15.1 °C | 116.08 mm |
| May | 8.2 °C | 19.8 °C | 131.83 mm |
| June | 12.8 °C | 23.8 °C | 134.62 mm |
| July | 14.9 °C | 25.8 °C | 117.09 mm |
| August | 14.2 °C | 25.2 °C | 99.06 mm |
| September | 10.5 °C | 22 °C | 95.5 mm |
| October | 4.6 °C | 15.8 °C | 85.34 mm |
| November | -0.8 °C | 9.1 °C | 88.39 mm |
| December | -4.8 °C | 3.6 °C | 104.65 mm |
| Annual | 3.8 °C | 14.4 °C | 1292.85 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |