I agree with everyone that the ambient air temp gauge (Rain gauge) is not a very practical item on a bike. I also agree that time and money would be better spent on making the other gauges work properly and Harley should install a practical gauge in its place like oil temp or something else to show vital functions.
I am not a meteorologist but from what remember growing up in scouting and having school science project too, I remember that if you were making your own "weather station"and you wanted to get accurate temps you made something about the size of a birdhouse with a solid top, louvered sides, and open bottom so that your thermometer was not affected by wind,rain or sun. Somehow I don't see that on a bike.

So I would think if you wanted to be 1/2 way accurate you would need to put the sensor behind the windshield out of the wind and some sunshade on top to prevent sun and rain from affecting your readings.
Personally I don't need a dash gauge to tell me if I am hot or cold.
