Clear skies and diminishing winds will allow for a chilly night tonight with temperatures expected to drop into the low and mid 30s.  A frost advisory has been issued by the National Weather Service.  Despite the chilly conditions early Friday, temperatures will rise into the upper 60s by afternoon.  The warming trend will continue through the weekend with highs in the upper 70s Saturday, lower 80s Sunday and into the mid 80s on Memorial Day.  Some areas could approach 90 by late the upcoming week.