My camp stove let me down in a drizzle, but I figured out a fix
I was camping last weekend and a light rain started. My portable stove would NOT light, no matter what. The spark maker got damp and failed. Now I always put the lighter and fuel in a sealed bag. This small step made a BIG difference next time. I tested it at home with a water spray. Keep your fire starter DRY or you'll have no hot food.