Accident, Maryland has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.7 °F (low) to 58 °F (high). Annual precipitation averages 52.3 Inches. Accident 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 | 18.4 °F | 34.3 °F | 4.42 in. |
| February | 20.2 °F | 37.9 °F | 4.09 in. |
| March | 26.6 °F | 46.2 °F | 4.67 in. |
| April | 36.6 °F | 59.1 °F | 4.47 in. |
| May | 46.7 °F | 68.0 °F | 5.06 in. |
| June | 55.1 °F | 75.0 °F | 5.22 in. |
| July | 58.9 °F | 78.7 °F | 4.9 in. |
| August | 57.6 °F | 77.5 °F | 4.24 in. |
| September | 50.8 °F | 71.7 °F | 3.93 in. |
| October | 40.1 °F | 60.3 °F | 3.47 in. |
| November | 30.5 °F | 48.4 °F | 3.49 in. |
| December | 23.2 °F | 38.6 °F | 4.37 in. |
| Annual | 38.7 °F | 58 °F | 52.33 in. |
| 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 : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |