The Baltimore City mesonet site just reached 100°. The Bittinger location, located at ~2,600 ft ASL in Garrett County, is on pace for an all time record high.
Even Allentown (ABE), Ft. Indiantown (MUI), and Wilkes-Barre (AVP) are making a run at 100°.
EDIT: Ft. Indiantown (MUI) just reported 101° on the 6hr ob!
Reading, Harrisburg (MDT* & CXY), and Lancaster all hit 100°.
*MDT hitting 100° before 2:00 pm is rare. According to the IEM bot page it's only happened twice in record keeping, both in July of 1991.