It went all the down to 19 at Philadelphia International Airport on this date in 1986, a daily record.
That also was the earliest ever official reading in the teens in Philadelphia during autumn.
This morning, it’s a good 25 degrees warmer than that, and it should make it into the 60s this afternoon.
A decent cool-down is on the way, however, and the region could see its first snowflakes on Thursday night.
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