Orion LX Weather Station - Relative Humidity; Sea Level Pressure; Wind Chill

Orion LX Weather Station 73
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Columbia Weather Systems, Inc.
Relative Humidity
Popularly called humidity. The ratio of the actual vapor pressure of the
air to the saturation vapor pressure.
Sea Level Pressure
The atmospheric pressure at mean sea level, either directly measured
or, most commonly, empirically determined from the observed station
pressure.
In regions where the earths surface pressure is above sea level, it is
standard observational practice to reduce the observed surface pressure
to the value that would exist at a point at sea level directly below.
Wind Chill
That part of the total cooling of a body caused by air motion.