It MEANS that your birthday occurred when you happened to be in an area of low atmospheric pressure, which brought in moisture and precipitation. read more
It's been raining on my birthday for years. One day I was curious and looked it up in this mythical book at the library, and it had told me that when it rains on your birthday every year it means that you were meant for greatness. read more
General Knowledge questions at Funadvice. It doesn't mean anything - stop looking for significance where there is none. read more
The prayers for rain are specifically about rain in the land of Israel. We say, “God, please bring us rain,” and God does, but the rains descend on the central part of Israel with a significant amount of land paved so that a good part of the rains flow to the sea in drainage ditches and do not replenish the groundwater aquifers, needed for drinking water. read more