AmbientWeather.com: How do sensors placed in the shade on the north side of the house differ from weather stations with proper radiation shields or the National Weather Service?
Sensors placed is shade on the north side of the house will experience lower daily highs and higher daily lows because of the radiant heat (and cooling) of the walls and structure around it. This is known as thermal mass, and has a time averaging affect (just like the temperature of your pool will respond faster than a lake).
Therefore, your sensor array with the low thermal mass and out in the open is much more accurate.
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