Thunderstorm wind is the standout hazard at Monocacy National Battlefield, with 14 recorded events in the county — far outpacing hail and flash flood incidents combined. The battlefield's open fields and scattered tree lines offer little natural shelter when fast-moving summer storms roll through Frederick County, making exposed visitors particularly vulnerable to downed branches and dangerous gusts.
Before heading out, download a weather radar app and check it the morning of your visit, since these storms can build quickly on warm afternoons. Pack a compact emergency poncho and identify the brick or stone visitor center as your go-to shelter the moment you hear thunder — open ground is the last place you want to be. If you're driving an RV or towing a trailer, note that strong thunderstorm winds can affect vehicle handling on the access roads, so pull to a safe, sheltered parking area rather than waiting it out on the road.
Top recorded hazards in Frederick County
County dataFrom NOAA Storm Events (2024). Counts of recorded incidents — not all occurred at this park.
- Thunderstorm Wind 14
- Hail 2
- Flash Flood 1
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About Monocacy National Battlefield
During the summer of 1864, the Confederacy carried out a bold plan to turn the tide of the Civil War in their favor. They planned to capture Washington, DC and influence the election of 1864. On July 9, however, Federal soldiers outnumbered three to one, fought gallantly along the banks of the Monocacy River in an effort to buy time for Union reinforcement to arrive in Washington, DC.
Weather
Spring (March - May) Temperatures: Average high is 67 degrees with a low of 53 degrees Summer (June - August) Temperatures: Average high is 87 degrees with a low of 65 degrees Fall (September - November) Temperatures: Average high is 68 degrees with a low of 48 degrees Winter (December - February) Temperatures: Average high is 45 degrees with a low of 27 degrees (Source: www.usclimatedata.com)