Asian countries fall into three general climatic zones.
The weather of Tokyo is similar to that of Washington, D.C., the weather of Korea is closer to that of Fargo, North Dakota, and can get quite cold in winter. While Hong Kong and Taiwan are slightly cooler December through February, they are not markedly so. Finally, China is a zone all its own. Beijing has cold and windy winter weather, hot dry summers, and passable spring and autumn weather. Shanghai is a bit more like Hong Kong and Taiwan.