Winter weather in Tokyo can be chilly but it’s quite enjoyable.
The winter season lasts for 3.5 months, officially from December 4 to March 20, with an average daily high temperature of 12°C (about 54°F). Mornings and evenings can be chilly. The coldest month is January, with an average low of about 5ºC (37°F) and high of around 10ºC (49°F).
Generally, Tokyo winter days are sunny with little rain or snow. On Thursday, I was golfing under a clear blue sky with moderate temperatures!