The last time Dayton had both at least a slightly cold April and May was in 2016, which was followed by a hot summer. Recent years prior to that were 1997, 1996, 1995, 1992, 1990, 1989, 1984, and 1983. Only 3 of those years (1995, 1989, and 1983) with a cold April and May were followed by a hot summer. Four of those years (1997, 1992, 1990, and 1984) with a cold April and May were followed by a cold summer. A cold April and May in 1996 was followed by a near normal summer.