What is the time distribution of rime?

Rain stops are more common in mountainous areas and lake areas. In most parts of China, the rainy season occurred from February 65438 to March the following year. The distribution characteristics of annual average rainy days in China are more in the south and less in the north (however, due to the warm winter, there are few low temperatures near zero in South China, so there are neither hail nor rainy days); There are many wet areas and few dry areas (especially in mountainous areas). Almost all the stations with an average rainy day of more than 20 ~ 30 days in China are alpine stations. However, the average annual rainy days of most stations in the plain area are below 5 days.

Rainy days mostly occur from the first ten days of 1 to the first half of February, with the characteristics of early in the north, late in the south, early in the mountains and late in the plains, but the end is the opposite. In mountainous areas with higher terrain, the rime starts early and ends late, and the rime period is slightly longer. For example, in Guangmingding, Huangshan Mountain in southern Anhui, the rainy season generally begins in early October of 165438+ and ends in early April of the following year, lasting for five months. According to statistics, the rainy weather in the Jianghuai basin occurs once every 2-3 years along the Huaihe River and once every 7-8 years in the south of Huaihe River. However, in mountainous areas, there is a big difference between valleys and mountain tops. In some valleys in mountainous areas, there is almost no rime, while in higher mountainous areas, there is almost every year.

In 1960s, there was no snowstorm in Guangzhou, and only 0. 1, 0.7 and 0.5 days appeared in Shanghai, Beijing and Harbin on average every year. The meteorological station with the most rainy days in China is Emei Mountain Meteorological Station, with an average of 14 1.3 days (maximum year 167 days), followed by Jinfo Mountain, with 70.2 days (maximum year 93 days), and the third place is Lvcongpo, Badong, Hubei Province, with 61. There is neither much nor much rain in the north, especially in arid areas. The places with the most rainy days in the north are huajialing, Huashan and Changbai Mountain Tianchi, which are commonly known in Gansu Province, with an average of 29.6 days, 19.8 days and 18.5 days respectively, and are also high mountain stations.

In the wettest season, warm spring and autumn are most common in the northern part of winter. For example, the wettest month at Tianchi weather station in Changbai Mountain is May, with an average of 5.7 days, followed by September, with an average of 3.5 days. Due to the low temperature in winter, there is no rainy day from February to March in 65438. In the south, it is colder in winter. For example, the average rainy days in Emei Mountain Meteorological Station in June 5438+February are as high as 26.4 days, and the average rainy days in June 5438+ 10 are as high as 24.6 days. Even some years, June 5438+February, June 5438+ 10, March, have rainy days every day.