why is it so cold as the dawn breaks?

Ever stood outside between the hours of 4am and 7am in the fall or winter? It seems to get noticeably cold just as the light starts to appear. It might be due to a rise in humidity?? If so, I have a theory - the sun's rays, while still "overhead" are pushing the humidity down to ground level, making it seem considerably colder (bone chilling in fact). Am I way off? What's your theory?

Nah, your body temp falls early in the morning. Normal daily rythym thing.

dude, no way. I've worked enough midnight shifts and all to know it's something to do with the actual temperature (or perceived temp.) that time of the morning. Try it sometime...

Chuckle, well.... that's my theory anyway.

perhaps my theory isn't the most scientific, but possibly close to the truth. Try here:

http://www.physicsforums.com/showthread.php?t=7408