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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from The Land of Footprints by Stewart Edward White: 65.
Of more importance than the actual or sensible temperature of the
air is the power of the sun's rays. At all times of year this is
practically constant; for the orb merely swings a few degrees
north and south of the equator, and the extreme difference in
time between its risings or settings is not more than twenty minutes.
This power is also practically constant whatever the temperature
of the air and is dangerous even on a cloudy day, when the heat
waves are effectually screened off, but when the actinic rays are
as active as ever. For this reason the protection of helmet and
spine pad should never be omitted, no matter what the condition
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