On Tue, 28 Oct 2008 06:26:14 -0700 (PDT),
wrote:

I plan on installing a tempeture guage inside the cockpit of my
glider. I think it's a good thing to have that can add to safety.
For instance, it's nice to know just how hot it is during those summer
days on a short runway.

Others have commented here on thermaling, but I'd like to add that I
wouldn't set much stock by an OAT for predicting density altitude.
Without airflow to stabilize its own temperature, it will just tell
you the temperature of whatever cockpit part it's attached to. Or
more, if it's exposed to sunlight.

In order to get the air temperature on the ground, you need a
thermometer in a well-ventilated and fully shaded spot, insulated from
its support.

rj