It is official, rainy season has been declared in Japan. Or at least my part of Japan. I am happy to report that it rained on the start day. There is a good chance of rain every day in the forecast.

I just wish I could find the official JMA announcement of the commencement of rainy season. How do you really know when rainy season starts and when it ends? What is the criteria used, and what is the vehicle for the announcement?