Atmospheric temperature fluctuations


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I would like to know the order of temperature fluctuations in an open atmosphere in two cases.

If I hang a differential thermocouple (with two junctions are about 5 cm apart)in open atmosphere what order of fluctuations it should show for about a minute (in normal circumtrances. ie with out A/C and any other external source which can have any effect in the surrounding temperature)?

What will be fluctuations in temperature at the mid point (inside) of a 50 x50 cm cube copper block kept in open atmosphere ?