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Yes , moisture is nasty on any cars secondary ignition system
An old trick we used to use if the car was having a hard time starting/runnng in rainy weather was to coat the wires with a quick spray of WD-40,,if the car started right off, we knew the wires were junk..WD is a Moisture displacer [ Water Displacement is the WD part]
But on the Waste spark , I agree that first suspect before coils is the coil to plug connectors under each coil...they are very common, to the the point that most Techs will change then at each plug change b/c of their known fail rate..but the waste coils are still high on the list, mostly due to the fact that they use One coil to fire two cylinders , in Series ..us they are heat trapped with their location...
Anyway..if one does suspect a failing coil in these systems , by moving the suspect coil to another location and seeing if the misfire follows the swap is a cheapo diagnostic trick for the DIY who has no Scope, etc...that is a diyer way of part failure confimation before purchase.