This was gleaned form talking to a Phd (meteorology) instructor,
Citation, Super Cub pilot.

Water will not freeze until it is 0 C or below.
Just because it is 0 degrees or below doesn't mean water HAS to
freeze.
There is themometer error, but there are also lower pressure areas on
the wing/airframe, and due to the lower pressure, the temperature
lowers.
It is possible to get ice when your themometer reads above zero, but
it will be zero or below where the ice is.
If you get ice on your themometer and it reads above zero, your
themometer is out of calibration.


Peter R. wrote in message ...
Dave ) wrote:

How do you know your guage wasn't wrong?

The digital gauge was calibrated when new and the aircraft is about one and
one half years old. Is it possible that it slipped out of calibration a
degree or two? I suppose.

But since every icing article I have ever read states that icing can occur
at temperatures higher than 0c, I have no trouble believing that my icing
encounters above 0c actually did occur one to three degrees above 0c.



--
Peter












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