I have been staring achingly at the temps this AM which just cant seem to get above 30 F. There doesn't seem to be much frost on the trees though. The dew point is listed at 23 F. Does this mean that frost won't appear until temps approach 23? How is the dew point calculated? Does JM damage occur from the frost or from the plant cells freezing, or both? (I am hoping that someone says that the lack of visible frost is a good sign!) Any input from budding metereologists welcome!