With the recent extreme heat in the Northwest, I wanted to see how high end warm days have changed in recent decades. This map shows the change in the value of the 99th percentile Jun-Aug day (high temp) between the 1991-2020 and the 1961-1990 periods. 1/ pic.twitter.com/oDrhc6bxZ2

— Brian Brettschneider (@Climatologist49) July 6, 2021