On Sunday, the city reached 100 degrees Fahrenheit for the first time since record-keeping began in the 1890s. For 135 years, Tampa had remained one of the largest U.S. cities never to hit triple digits.

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.