Your question isnt limited to the southern Hemisphere.
I live in a city. I nor anybody around me wants rain at any time. Sure the farmer who grows my food needs rain but he lives nowhere near me and isnt affected by whether it rains where I live. Furthermore I live in a climate that doesnt have a rainy season and dry season it rains throughout the year sometimes appearing as snow.
Yet we all make this seasonal distitinction, as do they even though it arguably makes less sense for them.
What is a shaalah is if rain in their locale was actually harmful. IE they have a dry season during our summer when rain would harm crops and they dont want it.