| This is EVAPORATION related only, the wind as no effect on (dry) object.
| A dry peace of metal wont go below ambient temp wind or not, but if you put
| humidity on it (water and such volatile liquid), now the temp will drop.
Your statement is true if the humidity levels are below 100%. However, if the
atmosphere is at 100% humidity, evaporation cannot occur and therefore the
cooling effect of evaporation can't happen. The lower the humidity, the
quicker evaporation rate and the greater the cooling effect (until the water is
There is another caveat to add to this dynamic as well..."traditional cooling".
It's the opposite of traditional heating. On a crystal clear cloudless night,
objects do typically drop a few degrees below ambient air temperature due to
the retained heat within those objects being "radiated" from the surface of the
objects and out directly into space. That is how frost _can_ occasionally form
on the surface of a car when ambient air temperatures are 33-36 degrees
(sometimes as high as 40 degrees) and when the wind is very light.
Heat _flows_ from warmest to coolest and always attempts to achieve a
equilibrium. At night, objects on the surface of the earth are relatively warm
compared to the temperature in space. Without clouds (especially), some of
this retained heat energy radiates out into space from the objects (like your
car). The cooling of these objects actually contributes significantly to the
cooling of the air itself.
The opposite, of course, is traditional heating where a object can be heated
above ambient temperature by a distant heat source (e.g. radiator,
fireplace/campfire, the sun). We are all familiar with that.
But, having said that, the difference is small...only a few degrees. And, as
pointed out earlier, wind by itself will _not_ make the object cooler (or
warmer for that matter) than the ambient air temperature. Actually, wind helps
keep the object closer to ambient air temperature. When an object is impacted
by traditional cooling, wind warms the object up a degree or two closer to
ambient (but never above ambient). When the object contains a heat source (or
is heated by radiant solar energy), the wind cools it down a degree or two
closer to ambient (but never below ambient).
Clear as mud, right?! :-)