While the Philadelphia Airport clocks in with their 11th warmest summer ) June 1 - August 31 - Some Chester County PA Station Summer average temps and the all-time summer rank (years of station history) - none recorded anything close to a top 10 summer
ChescoWx - 73.0 - 40th warmest since 1894
Glenmoore - 73.3 - 38th warmest since 1956
Phoenixville - 74.5 - 31st warmest since 1893