The first day of summer in Maryland came with a warning: Code Red—Extreme Heat. Across the state — from the panhandle to Montgomery County to the Eastern Shore – residents endured temperatures above 90°F. This heat wave caused more than 1,600 emergency room visits in one day throughout the mid-Atlantic. Since then, the Washington metro area has endured weeks more of temperatures above 90°F, peaking at 104 degrees in both D.C. and Baltimore.