Jim I would say this is a good question for you.
If Heat and cold effect the calibration of a RD, and I asume its out of calabration because of the L.O. (Is the L.O. on a RD have a crystal??) If yes would the best Temp for the RD would be 80 degrees.
Anyways my theory is, if or RD are effected by heat and cold why wouldnt a police Radar be effected by heat and cold making it go out of calabration making tickets easier to fight, which could mean you could request that the RADAR be checked for calabration errors.