Heat Index Levels: Last 10 Years (Cleveland, Ohio) and Others

This weekend will feature our first days with heat indices in the mid to upper 90s this year. Some have surmised that our weather has been more humid than in recent years.  Here are plots showing the number of hours the heat index reached at least 80 degrees. BLUE denotes current year. RED is the average for each period.

Drought year of 1988:  36 days above 90 degrees