In major cities such as Washington, D.C., Baltimore, Philadelphia and New York, the temperature was forecast to approach 100 degrees through at least June 24, which would mark the first time in many decades that triple-digit heat has been experienced in June, AccuWeather said.

Let’s start with what “normal” or “average” is for July, August and September. July and August average high temperatures are between 80 degrees north and 83 degrees south. September’s temperatures typically start to cool a touch into the 70s by the end of September.