It's April 6 and for many across the US, March was one of the hottest on record. For the Great Lakes, Northern Plains, and entire Eastern US, the temperature pattern has been pretty wild with temps soaring through the 70s, 80s, and 90s followed by a cold front that drops temps back below freezing (and snow across the North). I wanted to see historically how often the last frost (temp of 32°F or less) was after today and here is the map!