If you are someone who is searching for knowledge about Catholicism, then the best place for you to learn is at the Vatican. The Vatican is the center of the Catholic faith, and of course higher learning of the Roman Catholic ways.
The Vatican climate is the same as Rome's; a temperate, Mediterranean climate with mild, rainy winters from September to mid-May and hot, dry summers from May to August.
Vatican City is a city state that came into existence in 1929. It is therefore to be clearly distinguished from the Holy See, which already was in existence for many centuries before that date.