19.6 for me at 4:36am. I just set up my weather station at noon yesterday at my new residence (apartment) that I moved to 1 week ago. I'm still in Carlisle but in South Middleton Twp now, moved from North Middleton Twp after living there for 8 years. I'm in a brand new apartment complex called Summerbridge. 298 units with solar (9 panels per unit). I've got the best exposure (location of the equipment) for any place I've every lived. Only minor issue is the wind is connected to the temperature so the sensor unit is mounted at 6 feet to get accurate temps, but wind no longer at 10M. Temp accuracy much more important, though.
Needless to say there's heavy frost everywhere this morning and there's solid ice in the drainage culverts from the standing puddles of Thursday's rainfall.
The manager of the apartment complex let me set up the station, so it will be the "offical" weather station for Summerbridge. For anyone interested here's my Weather Underground link to the station:
https://www.wunderground.com/dashboard/pws/KPACARLI73
Finally, I received some emails from my weather friends back in NJ this morning. The state climatologist (based at Rutgers in New Brunswick) reported a low of 19 degrees which broke the record of 21 set back in 1992. The 19 degrees was also the coldest temp recorded so early in the season. He went on to mention that just once month ago, on October 2nd the station hit a record of 95 degrees which broke the record for hottest reading so late in the season! Wow!