What makes your run-of-the-mill snowstorm a blizzard?

Forecasters at the National Weather Service say a storm must show “considerable falling or blowing snow,” wind over 35 mph and visibility of less than a 1/4 mile for at least three hours. When all of the conditions are expected, scientists will issue a blizzard warning. When two of the conditions are met, they will issue a “winter storm warning.”

Here are the five worst storms to achieve blizzard status in the city for the month of March, according to the National Weather Service.

March 12, 1888: This two-day blizzard, which dumped 21 inches on the city, was the worst to strike the city in March.

March 8, 1941: Central Park saw roughly 18 inches of snow.

March 4, 1960: A two-day nor’easter produced 14.5 inches of snow.

March 13, 1993: The “Storm of the Century” generated 71 mph winds and nearly 11 inches of snow at LaGuardia Airport.

March 5, 1981: A mix of rain and snow brought 8.6 inches of accumulation to the city, which turned out to be the biggest of several storms that took place during that month.