Felly sgrifennodd John Hall :
The wet-bulb temperature shows the effect of evaporative cooling on a
wet surface, so the lower the humidity the greater the difference
between dry and wet-bulb temperatures. At 100% relative humidity they
will read the same. Note that if the wet-bulb temperature is below zero
then frost or snow won't melt, even if the dry-bulb temperature is above
zero.

There's also the dewpoint, which also is an indicator of how dry the air
is, as it's the temperature to which the air would need to be cooled for
the relative humidity to reach 100%.

What's the difference between wet bulb and dewpoint? Dewpoint can clearly
be calculated if you know temperature and humidity (well, my weather
station does it), but can wet bulb be calculated? Your description above
suggests it can be (so why would people bother measuring it?).

From your description above, there's not any obvious difference.

Adrian

--
Adrian Shaw ais@
Adran Cyfrifiadureg, Prifysgol Cymru, aber.
Aberystwyth, Ceredigion, Cymru ac.
http://users.aber.ac.uk/ais uk