Highest temp ever in Central Park = 106
According to this. Unfortunately, it only records up to 1993, but I'm still looking for newer data. Note the number of years recorded = 125, more than any other station on the list.
If you had actually read the article in Buck's post, you'd know where that 111 was recorded: on the subway platform at Penn Station. That's two levels below ground, btw...
I've been there in August. The only relief is when a train comes in, pushing a column of air in front of it. Not any cooler, just moving.
