I think that the wet-bulb temperature is the critical one. IIRC
that
lies in between the ordinary "dry bulb" temperature and the dew
point,
Knowing any two of the three temps, I imagine one could calculate
the
third id one knew how.


.... the Internet is awash with these calculators: the problem is
knowing which ones are right!

This one *appears* to do a good job, but I haven't checked it across a
broad range of readings ....

http://www.srh.noaa.gov/epz/?n=wxcalc_dewpoint

Martin.



--
Martin Rowley
West Moors, East Dorset (UK): 17m (56ft) amsl
Lat: 50.82N Long: 01.88W
NGR: SU 082 023