Is it cold in Iwate Prefecture, Japan? What is the lowest temperature in winter? Is there a belt for short sleeves in summer? What about the down jacket?

It's very cold. The average minimum temperature in winter is-1~15 degrees Celsius. I still need to wear short sleeves in summer, because the latitude is the same, but I need to wear a thick down coat in winter. However, I have been to Iwate Prefecture on business. There are many forest parks there. In winter, I can ski and shuttle through the pine forest. It feels great! Are you going? If you go, you won't be disappointed.