Short-term Memory

In California, in May, it always rains;
but no one seems to remember.
Every year someone comments on the rain, saying it’s out of sorts;
And I remind them that it rains every year in May,
but no one seems to remember.
I know, because one year I paid attention; because I didn't expect it but I noted that it happened.
And that it fell again the year after - and the year after; and while I noticed the rain I noticed too that people didn't expect it and saw it as abnormal. But it happens every year.
It rains in May.
Now I wait for the person who comments that it’s raining in a month where no one expects the rain,
because I’m paying attention and I expect the rain.