Help me check this out?

This evening on a local news show the weatherman (yes, he was a man, I'm not being politically insensitive) said that it will rain this Sunday which will be Easter Sunday. Then he went on to say that there is an old saying that if it rains on Easter Sunday it will rain for the next seven sundays.  I hadn't heard that statement for years but my father used to say every time it rained on Easter. He always said it with total conviction so I believed him.  Every time I tried to keep track though I usually forgot about it along about week three or so.  But not this year. I am going to see if this old saying checks out, that is if my PMA syndrome doesn't kick in.