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Jack Large
Call the weatherman or make a Barometer
See how here www.josepino.com/?howto_barometer that shows relative humidity
If fyou need it in inches you will need a Mercury Barometer.
Mercury barometers use a glass tube filled with mercury and inverted over a mercury-filled chamber. Normally, the atmosphere at sea level can support the column of mercury to 29.92 inches. .
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