This paper analyzes the reasons why Santa Claus wears thick clothes in Europe and America from the aspects of geographical location, season and climate.

Geographical location: Most countries in Europe and America are located on the west coast of the mainland at 40-60 north latitude. The United States takes North America as an example, the dimension is also 30-70, and the latitude is generally high.

Season: Christmas is in winter, so it goes without saying that the temperature is low.

Climate: Most European countries have temperate maritime climate, and the coldest monthly average temperature is above 0℃. The United States takes North America as an example, and the United States and Canada cross temperate and frigid zones respectively. The United States is dominated by temperate continental climate and sub-frigid coniferous forest climate. Northern Canada is in the Arctic Circle, which is a world of ice and snow. The area with the highest temperature below 0℃ in Leng Yue accounts for 3/4 of the whole continent.

Conclusion: It is wise for Santa Claus to wear thick clothes.