La Crosse Technology WS-7136U Instruction Manual page 7

Notes on Outdoor Sensor Placement
The remote temperature sensor should be
placed in a dry, shaded area. Fog and mist
will not harm your remote temp/humidity
sensor but direct rain must be avoided.
The remote temperature sensor has a range
of 80 feet. Any walls that the signal will
have to pass through will reduce distance.
An outdoor wall or window can have up to
30 feet of resistance and an interior wall can
have up to 20 feet of resistance. Your
distance plus resistance should not exceed 80
ft. in a straight line.
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