Here is weekly weather forecast, week of Jan 29, 2018.
Today, it was 6.4℃(43℉) at 8pm and it was okay NOT to wear a heavy coat like down jacket.
We may have snow again later this week. Probability is 60% at as of today, but it may change so please check before you go out. Temperature would be about the as average year, which is high of 10℃ (50℉) and low of 2℃ (36℉).
Weather bureau has an English page on their site and you could see variety of weather information.
source : http://www.jma.go.jp/en/yoho/319.html
