Tampa reached 100 degrees for the first time in recorded history. It's a rare milestone for Florida, where humidity, sea breezes and frequent storms usually keep temperatures just below the triple-digit mark.

An air temperature of 100 degrees F was recorded for the first time since record-keeping began in 1890. Here's why that might be surprising.

Daily weather observations were collected in downtown Tampa at what had been the U.S. Weather Bureau Office. In June 1946, the office was moved to Drew Field, which later became the site for Tampa International Airport. Record-keeping has continued there ever since.