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post #37 of (permalink) Old 6th January 2009
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The ground heats/cools the air, therefore the higher the thermometer, the greater the lag in it mirroring ground temp.

So, if you approach a cold night, the ground gets cold first, then cools the air. However, the next morning as temps increase, the ground warms first and then warms the air.

If memory serves - which it doesn't too often.
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