Misfires in damp weather is usually dampness (which might be nearly invisible) affecting a high voltage component, coil, spark plug wire/boot etc. So whatever the problem is , it is almost certainly limited to the high voltage components of the ignition system. Many years ago I had a VW Rabbit that would stall out every time I ran over a big puddle. If I waited for 15 minutes then it would start and run fine the rest of the day as long as I didn’t run over another puddle. On the weekend I’d spray the engine compartment high voltage components from every conceivable angle with a garden hose to try to determine the problem and never got it to even hiccup, let alone stall. Next puddle, stall. So I bit the bullet and removed the coil and bench-inspected the case. Sure enough, a tiny nearly invisible crack in the ceramic underside. After a new coil installed , no more puddle-caused-stalls.