As per the World Meteorological Organization (WMO) Current climate normals are calculated using the past 3 complete decades and recalculated every 10 years. So, I went back and calculated what was normal for the last 10 climate normal periods specifically for Chester County PA. The below show what the climate normals were for the 10 years following each calculation with the earliest being 1901-1930 normals and the latest being our current climate normal period of 1991-2020. Averages in red are the warmest and blue the coolest across those periods. Of note our warmest climate normal period was 1931-1960 and our coolest period was 1961-1990.
We had a close call with a pair of tornadoes (1 confirmed) that flanked me the other night. It did rain quite a bit. Then the mother of all CG barrages at about 4AM. Literally dozens of strikes within a half mile just shaking the house. It was wild. Looking like another busy day tomorrow.
Main question is whether the dry line will erupt with storms ahead of the front. I think it will, but I don't know if that is down here or up in KS. Pretty certain to get a good line of storms later along the front.