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The Effects of the Weather when Walking, Hiking & Rambling
Mountains accentuate changes in weather conditions
and local situations can accentuate these conditions.
Temperature falls markedly the higher you climb. Experts estimate that
the temperature can drop by 1 degree Centigrade for every 150m rise in
altitude.
In very dry air, the fall may be 1 degree Centigrade for 100m rise in altitude.
In cloudy conditions, this may be 1 degree Centigrade per 200m.
Air is usually drier and warmer on the lee side of a hill.
The precise relationship between wind speed and altitude is hard to establish.
However, there is a funneling effect of wind at valley heads - often very
noticeable in the Lake District.
It's estimated that an increase in actual wind speed can
produce a significantly greater force on an object. If wind speed increases
by factor of 3 (say from 10mph to 30mph) then force exerted will increase
by factor of 9!!!
In mountain areas, rain is both more frequent and heavier - local conditions
and topography can have a profound effect.
Rain or sleet in a valley may mean a blizzard at the top of hills.
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