With the summer season quickly approaching and the fact I now have access to much more station data then in the past. I went back to the complete Chester County PA data set of 26 stations with some having data back to the 1890's. I wanted to see if the number of hot days as defined by 90 degrees is increasing or decreasing here in Chester County?? I separated the stations by their elevation above sea level as we know with increasing elevation there are far less days that surpass 90 degrees. Of the 26 stations in the data the majority (17) stations are sited below 500 ft above sea level (ASL) While only 9 stations are sited at above 500 ft ASL. Going forward with the data here in the 2020's we will still have the majority of stations (11) that are located at lower elevations while 7 of the current stations are in the relatively higher spots.
The data which is analyzed by average number of 90 degree days by decade is quite clear that the number of 90 plus days is decreasing at all elevations. In fact the 2020's to date are trending as the 2nd least 90+ days at the lower spots and at the lowest level in the higher spots. Can you imagine back when we really had hot summers like in the 1930's through 1950's how tough it must have been without air conditioning??
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