"Hasta el 40 de mayo, no te quites el sayo."
Meaning one never know what May will bring in terms of weather. You better be safe until May 40th! A lady quoted this to me the other day because this month has been crazy ... lots of rain, sun, rain again, cold, warm ... one never knows what to wear. As I mentioned the next day we were supposed to get rain again, she said the expression above.
Ps. "sayo" is an old word for "abrigo" (jacket).
