Rain will not affect the sensor, only pressures. But please remember, pressure fluctuate with temps, and even altitude to some extent. A ten degree drop in ambient temp will reduce air pressure approx. 1 lb. A rise of ten degrees will increase it by 1 lb. I also believe the higheer the altitude, the more the temps rise and fall.
The air pressure in the tires should be checked on a cold tire, which is a tire that has not been driven in at least three hours. In addition, make sure the sun is not shining on the tires. Direct sunlight can increase a tire pressure by 1-2 psi.
Best time is early in the AM, on a cloudy day.
Living here in MI, the cloudy days are common, as I am finding out. I usually check mine twice a month on Saturday or Sunday.
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Black Sheep Hummer Squadron
(ME TOO)
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