Climatic characteristics of tropical monsoon in sub-frigid zone

The sub-frigid zone appears between 50 and 65 north latitude, with a banded distribution, spanning North America and Eurasia.

The northern part is bounded by the hottest month 10℃ isotherm. The climate in this area is mainly influenced by the polar ocean air mass and the polar continental air mass, which is the source of the polar continental air mass. In winter, there are many opportunities for the Arctic air mass to invade. In warm seasons, tropical continental air masses can sometimes penetrate. The main features of this climate are: the winter is long and cold, the average temperature is below 0℃ for 5 ~ 7 months every year, and the cold weather of -50℃ often occurs; Summer is short and warm, and the monthly average temperature is above 10℃, and the highest temperature can reach 18 ~ 20℃, especially the annual variation. The annual precipitation is generally 300 ~ 600 mm, mainly in summer rain. Due to weak evaporation, the relative humidity is very high.

The sub-frigid climate is distributed in northern Europe, northern Canada and Russia.

Tropical monsoon climate is a kind of climate type, which is characterized by high annual temperature and great difference in precipitation seasons, including dry season and rainy season. It is mainly distributed in the south bank of the Asian continent from 10 to 23 26 north latitude, and it is a unique climate in Asia. It is distributed in China, Guangdong Leizhou Peninsula, Hainan Island, South China Sea, South Island of Taiwan Province Province, Indo-China Peninsula (north of central Malay Peninsula), northern Philippine Islands, South Asia and other regions, that is, the South Asian monsoon region. April to September is the rainy season, and June to March is the dry season. The annual average temperature is above 22℃.