I havent actually called while it is raining but I have heard several different opinions. Most are from magazine articles and such from all over the country that tend to say it doesnt work. But most everyone I have talked to on the wet side says it doesent matter, some even say wetter is better. Guess its all what the dogs are used to. My first yote was called in at 3 in the afternoon, not 5 minutes after a terrential downpour stopped. I had been sitting there waiting, the rain stopped, I let out some screams on the call and there he was.