The month of April is typically 10.5 degrees milder than the month of March. So far this April, however, the first two weeks have been chillier than March (which was the fourth mildest on record). This made me curious about whether there have been any Aprils that were colder than March (going back to 1870). The answer is no. The closest this came to happening was in 1946 when April was 0.6 degrees milder than March. The chart below lists the five Aprils that were closest to March's average temperature.