The granddaddy of March winter storms in Baltimore came at the end of March 1942, known as the Palm Sunday storm. An innocuous weather forecast called for flurries in western areas, but what started as rain ended up as snow from 2 a.m. that Sunday through 9 p.m. that evening, dumping 22 inches. Cars were abandoned and streetcars and trolleys halted. One local weatherman, John R. Weeks, called the storm a "freak". Spring robins were said to be "bewildered", "bedraggled" and "forlornly" searching for food. (Source: Baltimore Sun). (11.5 inches National Airport (WP).
A mammoth snowstorm that struck the region over a century ago still holds the record for the highest March snowfall tally in D.C. That storm produced a foot of snow in the city March 27 to 28, 1891. (WP).