yep, learned that in meterology last semester...typically the lowest temp is reached just as the day is breaking.

also, if theres heavy cloud cover over night, the lows wont be as low as if it were clear...clouds help keep the heat in i guess...

always wondered why id walk outside on the porch to decide what clothes to wear hunting...not get sweating walking to stand or anything...and then id be freezing waiting for the sun to rise and warm me back up! i dont know how much of a difference there typically is from say an hour before that lowest low, to the lowest low...but ive felt it and sometimes its very noticable...