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Your own source suggests you've got that part backwards:
Originally posted by BIHOTZ
Those high pressure systems going hand in hand with really warm weather as they are known to produce. ...
Air pressure is not uniform across the Earth however. The normal range of the Earth's air pressure is from 980 millibars (mb) to 1050 mb. These differences are the result of low and high air pressure systems which are caused by unequal heating across the Earth's surface and the pressure gradient force.
Lows are usually associated with high winds, warm air
Pressure increases here because more air fills the space left from the low. Subsidence also evaporates most of the atmosphere's water vapor so high pressure systems are usually associated with clear skies and calm weather.