Why do you talk about the weather in Japanese greetings?

Because this island country has a maritime climate, it is often sunny in Wan Li in the morning and it rains cats and dogs in the afternoon. In the past, agriculture, especially fisheries, was closely related to the weather, so people naturally paid attention to the weather changes. And the Japanese don't want to ask too much about other people's privacy, so they ask where you are going. Nothing is appropriate to eat, and the weather has become the best way to greet.