|Large display temperature readings
are rarely accurate for several reasons:
1. They are not calibrated, or checked for accuracy on a regular basis as
are the official National Weather Service thermometers.
2. They are usually located above hot parking lots.
3. They can be exposed to the direct rays of the sun making them
There have been two official National Weather Service methods of measuring the air temperature.
First, the instrument shelter
and then, second, ASOS.
The above photo shows the total ASOS installation at Haines, Alaska.
Photograph by Tom Burgdorf
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