The Davis sensor response is no where near an ASOS probe. The Davis has too much thermal mass. I’ve subbed the Davis out for a sensirion SHT75 (tiny) and with a FARS it jumps around at times 2-4°/min like an ASOS can.
I’m not suggesting the BOS sensor is faulty, but are there legit 100° readings out there west of BOS to trigger the 98°? The 2 99s I see on mesonet are Airnow sites and they’re trash. The ORH Airnow at 1kft is 100°.