By Geoff Bansen

PHILADELPHIA (CBS) — Wednesday will be a cool, damp, dreary day.

Why are temperatures so chilly all of a sudden? A ‘backdoor’ front is now to the south of us, allowing an onshore flow to invade the Delaware Valley.

Highs on Wednesday will run 10-15° below average. There will be showers possible at any time during the day.

Thursday will be a carbon copy, again remaining unseasonably cool. A stronger system finally pushes east on Friday, bringing some heavier pockets of rain and a few thunderstorms, and lifting temperatures all the way back into the 70s.

It will also act as a bulldozer, clearing things out in time for the weekend – how does sunny skies and mid 60s sound?