Where Should You Place an Outside Temperature Sensor?
Manufacturers of outdoor temperature sensors strongly advise consumers to mount a sensor on the north wall of a building, out of direct sunlight and protected from precipitation under an eave, overhang or awning. The recommended height for installation is at least 2 to 3 feet above ground level.
The heat of the sun can cause inaccurate readings of outdoor air temperature if sensors are installed on the south, west, or east wall of a building. Although heights from ground level to eave level are acceptable for outdoor temperature sensor installation, manufacturers recommend leaving significant space between the ground and the temperature sensor, installing the sensor above the height of any expected snowfall and placing the sensor away from exhaust vents.