From Reddit , taken from a Yahoo News Article :

Excerpts:

There is an increased chance of a low pressure system passing to the south on the 31st and 1st.

This is identical to the system that brought heavy snow to the Tokyo area last week.

The air 1500 meters above Kanto is below -3C, presenting a high possibility for snowfall.

The current weekly forecast has a reliability rating of B or C and could change depending on the course of the low pressure system and changes in precipitation and temperature.

I really hate my birthday month in Japan. It’s the coldest month.

* Post taken from Reddit. Used without permission.

** Image from the Yahoo article. Used without permission.