The Old Farmer's Almanac daily calendar gives you quick reference for the significant events on any day throughout the year.
May 11, 12, and 13 are the feast days of Saints Mamertus, Pancras, and Gervais. These three are known as the Three Chilly Saints not because they were cold during their lifetimes, but because these days are traditionally the coldest of the month. English and French folklore (and later American) held that these days would bring a late frost. In Germany, they were called the Icemanner, or Icemen Days, and people believed it was never safe to plant until the Icemen were gone. Another bit of folklore claimed, "Who shears his sheep before St. Gervatius's Day loves more his wool than his sheep."
1996: After taking off from Miami, FL, a fire started by improperly-handled oxygen canisters in the cargo hold of Atlanta-bound ValuJet Flight 592, and caused the Douglas DC-9 to crash in the Florida Everglades killing all 110 on board25 Years Ago