I was curious how extreme this was in comparison to the past. I grew up near Philly so I looked at the Mount Holly historical data set. Since 1996, that’s the cutoff of the data I found, there’s been 4 summers with two 100+ days in a row in them. Zero instances of three in a row. Honestly it’s rare enough I didn’t believe it had ever been over 100. But it does seem like it’s a once every 10 or so years event. I’d already made plans to go to Florida. I guess I’m going there to avoid the heat this year.

Disclaimer: not trying to make a climate statement here just genuinely curious.

you should also cross index that with Relative Humidity, thats what will get you.

high humidity hinders evaporative cooling, and extremely low humidity is dessication. overheated core, vs dehydration

I'm curious which years they were.