When you buy a weather station, I recommend taking a good look at the radiation shield, because if the shield is not sufficient, all your readings are going to be way out of line. The air sensor itself may have a rating of + or - 2 degrees, but that is assuming it is not affected by direct sunlight, or the heating influence of the sun on the plastic... You do not have to have a fan for accuracy, but it certainly can help depending on the situation... I am not a fan of the rain gauge being attached to the anemometer... I have problems with wind tipping my gauge when winds exceed 20 MPH on my 5n1.
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