I don't think we are able to disable certain weather in any city. Also why does this bother you?
Actually, I didn't know that it's a single-player feature. So, I thought it could be a bug.... -_-
[remember that I didn't play a single player! i downloaded sa and before one month gets spent, I downloaded sa-mp and joined this server... I did hate sa a lot cuz of the character, CJ(
-removed- that's why hate). Then, Jizzy told me to play.]