I went back into the database (1894 to Present) to see what the 70 degree climatology looks like for November in Chester County PA
71 years of 128 (55%) on record have seen days over 70 degrees
The most 70 degree days in November in rank order
1975 - 8 / 1990 - 6/ 1896 - 7 / 1931 - 7 / 1902 - 5 / 1903 - 5 / 1913 - 5 / 1938 - 5/ 2020 - 5
The most consecutive 70 degree days in November were the 8 straight days between Nov 2nd and 9th in 1975 - this year is the 4th time we have had 5 straight 70+ days in November
The longest stretch between November's without a 70 degree was in this past decade between 2009 and 2014 we experienced no days over 70 degrees in November
Of Note in 1950 we actually had back to back days exceeding 80 degrees in November