My car wont start when it rains

My car ran poorly when it rained ( 2004 Hyundai Accent ) When we had a massive fog in December it was 54 it started backfired and would not start.I replaced all the spark plug wires and it started and ran perfect. It was cheap and easy- I am just the lady next door and changing the wires was easier then putting back together a food processor. Also a note to newer car owners_they MAY NOT HAVE a distributor cap. My fix 28.00.

Well, rain and snow is water, so it could be water is getting into something preventing the car from starting. maybe you have loose wires under your wiper grill at the bottom of your windscreen and the rain is shorting the electrics out, or even your doors could be letting rain inside shorting the electrics as your speakers terminals are not really protected with anything just a plastic clip. and of course electric mirrors if you have them?
common sence says to me you have a leak somewhere by you saying when it rains or snows. check all the roof, sun roof, door paneling, under the bonnet, boot door, all the elctrics you can get access to, and look for wet patches or puddles, if you see any near any buttons, wires etc you can be sure your electrics are shorting out. dont know if it helps but hope its somewhat helpful to you