It's cloudy today. You would think it's not worth remarking just a cloudy day. But, it's very much strange that it is cloudy today, October 10th, in Tokyo; the date is very much special on the long-time record of climate in Japan. October 10th in Tokyo has been and must be shiny, statistically! That's why Tokyo Olympics 1960 was celebrated on that date and has been long memorized as the national holiday since that time. We face the changing trends of climate here in Tokyo.