Hi
I have flown with someone who did there ME/IR in Spain and the training that he recieved was not good? basic stuff was not covered and he struggled with some stuff in line training, he even said that it was a mistake doing it there, as for weather, my personal experience would be if you do your IR in the UK with the weather that we have here, then you will cope quite niceley elsewhere? just my personal thoughts, but good luck whatever you decide.
PD