In article . net,
"Hilton" wrote:

Julian Scarfe

Absolutely true, but remember that your thermometer is one of the easiest
instruments in the aircraft to calibrate. The ATIS gives the temperature
on
the ground before flight -- it's well worth a check.

Although the temperature at the ATIS station and the temperature where you
thermometer is located may quite a few degrees off. Kinda like setting your
Heading Indicator when lined up on the runway.

Hilton



Not to mention that:

1) The ATIS could be up to an hour old

2) The ATIS temperature was taken with a thermometer in a carefully
designed enclosure which keeps it out of direct sun and wind. Your OAT
probe has none of those protections.

On the other hand, a slurry of crushed ice and water makes a pretty good
home-made 0C temperature reference. If you wanted to, I suppose you
could use that to calibrate your OAT-o-meter.