Could anyone convince him?

Because he was visiting Bulgaria?

https://profit.bg/klasatsii/mezhdunarodni/nay-studenite-gradove-v-sveta/ (18 Sep 2016)

https://web.archive.org/web/20201028113948/http://profit.bg:80/klasatsii/mezhdunarodni/nay-studenite-gradove-v-sveta/

Or maybe he was in Japan?  

https://web.archive.org/web/20200923001642/https://matome.naver.jp/odai/2142214980306907101/2142215080607979103 (2015/01/25)

https://web.archive.org/web/20200923001633/https://matome.naver.jp/odai/2142214980306907101/2142215080607979403 (2015/01/25)

The weather in Moscow during November, 2021 hasn't been too bad for this time of year:

https://www.holiday-weather.com/moscow/averages/november/

October 2021 wasn't too bad, either:

https://www.holiday-weather.com/moscow/averages/october/

Glasgow was even better:

https://www.holiday-weather.com/glasgow/averages/october/

https://www.holiday-weather.com/glasgow/averages/november/