FOUND MY PROBLEM:
It seems that when my vehicle was being assembled the wire harness installer allowed three wires to lie across a frame seam located along the entry way of the front right passenger door. This area is covered by a plastic threshold cover, which can be easily removed by upward pressure to relieve the plastic retainers underneath it. It seem these three wires were circuits for the Door Ajar switches, a tail light and a circuit to the Body Control Module. After a few years of entries into and out-of the vehicle these wires became chaffed to the point of making contact with the metal frame. It appears that during dry conditions, not sufficient grounding occurred. However, when the entire underframe became damp and/or wet it created a condition which permited the wires to be grounded completing and/or breaking a circuit. This sent an incorrect signal to the BCM creating a situation resultant of a door ajar, when there really wasn't.
If any member is having similar problems; it is very simple to check this out. Simply pop off the plastic cover along the bottom of the door way and inspect the wire bundle. Thanks to Matt Wagoner, Service Assistant and Glen, Electrical System technician at Bill Buck's Chevrolet in Venice Florida for their persistance and for their acceptance of my report of the problems experienced and to Tropical Storm Debbie for keeping the problem alive during their search for the problem. I have photo of the corrected cable. Unfortunately I don't know how to post it to this message.