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This is why Philly weather has been so bipolar in the past week

 United States

The tree-lined Locust Walk on the University of Pennsylvania campus is one of the city’s most pleasant spaces, with gothic ivy-covered red brick buildings dating back to the late 1800s. Photo: J. Fusco, GPTMC

This past week, Philadelphia has been engulfed by record warmth with temperatures soaring into the mid-80’s. That’s almost unheard of for this time of year, especially when the average high temperature is in the low-60’s.

To give you a perspective of how wildly our weather has changed over the last week, last weekend, temperatures were in the 30’s while 2 days later, we saw sunny and humid conditions accompanied by record-heat. This was all a result of a large high pressure system that parked itself over the Southeastern United States. As a result, it pumped very warm air from the south into our area during the week, which led to temperatures we will not see for a very long time.