I agree with the top comment, South Korea is much colder than Japan especially they are peninsula and not surrounded by ocean, to their north is North Korea which is unbearably cold and often compared to Mongolia, many people died there because the temperature drops below -25 degrees
I’m living in Korea and visited Japan several times. But it’s not that much different. You commented you don’t fly. So I think you can keep going your plan. I think it’s not a huge challenging.
South Korea is colder, although not hugely so: here’s a handy Seoul vs Tokyo comparison chart. Summers are basically the same (sweltering), September-October is around 3°C colder, winters are up to 10°C colder. So I would tackle Korea first, then fly to Tokyo and work your way south.
Note that in Japan itself there are significant regional variations. The Japan Sea coast (facing Korea/China) is colder than the Pacific Ocean coast (where Tokyo, Osaka and Nagoya all are), and in January it can be snowing in Tokyo while it’s (almost) beach weather down in Okinawa.
Credit:stackoverflow.com‘
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