Good to see a post from you!

The Korean peninsula has very pronounced seasons. Summers there are very hot and humid while the winter season is cold and dry. This is because of the monsoon effect in the summer and the reverse monsoon effect in the winter.

The interior of the Eurasian continent becomes very hot during the summer, which creates a persistent thermal low pressure zone in it, which draws in warm and humid air from the Pacific. During the winter the reverse happens and the cold dry winds from the north prevail.

Interestingly, the average nightly minimum in Seoul in January is -6 C, which is almost as cold as in Helsinki. The daily maximum in January in Seoul is a +2 C while that of Helsinki is -1 C. Seoul is much warmer in the warmest month (August) with the average daily max/min being 30/22 C whereas in Helsinki they're are 22/15 C in July, the warmest month. Helsinki is MUCH drier in the summer: 65% in July. The interior of Southern Finland is somewhat drier than that.

I live in Lahti about 60 km to the north of the Gulf of Finland. The region that has the most similar climate of all on any continent outside Europe is north-central Alberta, Canada. Somewhere between Edmonton and For McMurray is the locality that matches the climate over here almost as perfectly as possible on Earth.

The Rockies convert the latent heat in the moist air from the ocean brought by the prevailing westerlies into higher temperature while reducing the moisture and thus taking the edge off from the frigid northerly winds that sweep the North American plains unimpeded in the winter. The Scandinavian mountains do the same to the moist air masses from the Atlantic. Finland is similarly exposed to southerly winds bringing in very warm air masses during the summer.

Eastern Canada has more pronounced seasons. Northern Ontario and Quebec have warmer summers and colder, snowier winters. Even Saskatchewan has colder winters than Alberta. I think Winnipeg in Manitoba had the coldest winters of all the large metropolises of Canada. It's right in the center and does not benefit from the warming effect of any large body of water thanks to the prevailing wind direction.