When is the rainy season on 20 19? When does the rainy season begin?

According to the calculation of rainy season, spring will pass soon. Although many places have failed to enter the summer these days, the temperature is below 30 15, but it still can't stop the rainy weather. In fact, rainy weather does have an impact on everyone's travel and play. After all, no one wants to sleep in a wet bed.

rainy season

In different areas, the time to enter and leave Mei is unnecessary, as follows:

The rainy season in the south of the Yangtze River: June 8-July 9.

Rainy season in the middle reaches of the Yangtze River: June1May-July 14.

Rainy season in the lower reaches of the Yangtze River: June1September-July 12.

Rainy season in Jianghuai area: June 21-July 15.

Of course, this is only an approximate time, and the specific time also depends on the climate at that time.

The so-called plum blossom is also called "mildew" and "plum blossom". Refers to the day when the rainy season begins. Meteorological Meiyu refers to a rainy weather that transits from early summer to midsummer. Enter the meiyu period. Different climate seasons and plum blossom periods vary from place to place. We can't rely on the plum blossoms on the calendar to guide production and life, but to listen to the plum rain forecast released by the meteorological observatory.

In Jiangnan area, the mature period of plums in late spring and early summer is called Huangmei season. During this period, it was rainy in the middle and lower reaches of the Yangtze River in China, and the rain in this period was called Huang Meiyu. Because of the continuous rain and humid air, clothes are easy to get moldy, and Huang Meiyu is also known as mildew rain. The start date of Huangmeitian is called "entering Mei".

Calculation of rainy season time

According to the principle of combining circulation conditions with regional precipitation, during the period from late May to the first half of July, the ground peak activity is frequent within the range of 29-33 north latitude, with six rainy days for two consecutive weeks. At the same time, referring to the lower reaches of the Yangtze River, the average temperature of each station is basically stable above 22℃, which is the start date of entering Mei. In the time curve of rainy days, rainfall, cloud cover and other climatic factors in early summer, there are also days that suddenly increase (that is, there is a turning point), which is regarded as the average plum blossom period.

Traditionally, in China, the judgment of plum entry and plum exit is based on the combination of solar terms and branches. According to the calendar, the first third day after mango seeds is plum blossom, and the first last day in Xia Hou is plum blossom. If the weather on the awning day is C, it is designated as entering the plum blossom, and if it is not in the shallow summer, it is designated as leaving the plum blossom.

In ancient China, there were several rules for entering Mei. In trivial records, "(Min people) entered Mei on Geng Day in Xia Hou." "Shenshu Jing": "After the awn is planted, it will enter the plum in three days." "Jiangnan Record": "Plant mangoes in May, and meet your wife and enter Mei." "Tian Wu Jia Xing": "The rain after the awn seed is Huang Meiyu", and the awn seed is considered as plum blossom. There are two reasons for the above differences: first, regional differences; Second, the date of entering Mei for many years often changes. According to Shen, in weather analysis and forecast, it often refers to the day when the weather situation turns rainy.

For example:

On June 6, 2006, mango seeds fell and entered Mei on the same day. July 17 coincides with a weekend after the intense summer heat, so the plum blossom date in 2006 is July 17. Huangmeitian has a total of 42 days. The specific heart algorithm is as follows.

Enter the formula of plum blossom day: d =(7-Y)Mod 10, where Y=(5 (odd years)+[2 digits after the year ]) mod 10. In 2006, Y=0+[6/4]= 1 and D=7- 1=6, so it was June 6th. The formula is: D= 12-Y, Y=(6×5+[6/4])Mod 12=7 (see plum blossom entry for details), and D= 12-7=5, because July 5th is before light summer.