Indoor-Outdoor Thermometer - any good?

It is hard for me to believe one stuck to a window is going to give accurate readings. I would think the air temp next to the window would be somewhat distorted by the temp on the inside of the window, particularly heat loss thru a window on a cool/cold day.

I have a wireless indoor/outdoor thermometer. The outdoor sensor I hang in a shady place with free air flow and never in the sun to give an accurate reading.