just to be clear, where was the sensor located that read 37 deg fah?

Some sensor suggestions:

Avoid areas with temperature fluctuations caused by direct sunlight, and not representative of true outdoor temperature

Best location is on North or Northeast side of structure under eave or shielded from direct sunlight

Avoid placing sensor in close proximity of heat sources that may affect correct temperature sensing (fans, exhausts, vents, lights)

Avoid placing sensor in area subjected to excessive moisture

Use 18 gauge wiring (thermostat wiring) with no splices
Caution should be taken to avoid potential electromagnetic interference (EMI) by routing separately from potential sources such as line voltage wiring. When necessary, shielded cable may be used

The one reading 37 is low, near foundation on west side of house. The other high one is on the north side of house. The one reading 37 "is" about 10 feet horizontally from a direct vent furnace exhaust that comes through the foundation wall. I wonder if that is part of it. Being so cold this morning, I'm sure the heat was on.

that's the location I expected. you might consider relocating that sensor.

IMO

So you don't think anything's "wrong" with the sensor, just that it's in the wrong location?

What are your thoughts as to why the false high reading?