akuperma,
“it would seem that davening for a particular climate might be a bet dubious, though one supposes there is no harm is asking Ha-Shem to violate the natural order.”
We daven for weather-related things that we understand are beneficial to us. As we say between Sukkos and Pesach, v’sein tal umatar livracha – we daven for a good rainy season in eretz Yisroel. And outside of the rainy season when rain would be harmful to standing crops, v’sein bracha.