The Washington, D.C. area has a four-season Mid-Atlantic climate. Summertime is warm and humid, while winter can be cold and snowy. Spring: During these months of transition, the weather can alternate from warm, humid air coming from the south to cold, dry air coming from the northwest. Be prepared for changing conditions. Summer: The warmest months are June, July, and August, with average highs in the 80s (~31 ?) combined with high humidity. Temperatures often climb into the 90s (~34?).
Entrance fee - $0.00
There are no fees to the Baltimore Washington Parkway
There are no visitor centers along the Baltimore Washington Parkway. Greenbelt Park Headquarters is the location for the Baltimore Washington Parkway Maintenance Division The Baltimore Washington Parkway passport stamp is located at the Greenbelt Park Ranger Station located near the campground.