What is the meaning of "plum blossom" in the lunar calendar? How did it come from?

Plum blossom, also known as "broken plum blossom", refers to the end date of plum rain in the middle and lower reaches of the Yangtze River in early summer.

During the Meiyu period, the Meiyu front system and the main rain belt obviously moved out of the middle and lower reaches of the Yangtze River. If there are less than two rainy days in the five days in this area, the maximum temperature of each station in this area will obviously rise above 30℃, and the southerly wind speed on the ground will also obviously increase, so it will be designated as plum blossom.

Meiyu, also known as Huangmeitian, refers to the natural climate phenomenon of cloudy and rainy in the middle and lower reaches of the Yangtze River, Taiwan Province Province, south-central Japan, South Korea and other places every year from the middle and late June to the first half of July. On the first day after the awn was planted, it entered the plum blossom, which was the first plum blossom before sunrise in shallow Xia Hou. May always comes on June 6~ 15, and May always comes on July 8~ 19. There is an obvious rainy season in eastern China, with a long rainy season and relatively concentrated rainfall. Generally speaking, the higher the latitude, the later the meiyu begins.

Taiwan Province Province entered Mei in mid-May and came out in mid-June. In the middle and lower reaches of the Yangtze River in China, plum blossoms enter in mid-June and come out in early July on average. But there are some differences in specific places. In Zhejiang, plum blossoms enter the plum blossom in May of the lunar calendar. Specifically, plum blossoms enter the plum blossom in the morning after the awning, and they rise on the solstice of summer.

Extended data

The weather-confirmed plum discrepancy is different from that in the almanac. In meteorology, the division of plum blossom period, plum blossom period and plum rain period is determined according to the background of weather circulation situation, geographical distribution characteristics of weather system, geographical distribution position of precipitation and changes of meteorological elements. Because the evolution of circulation situation is not consistent or the same every year, there are complex differences in meteorology, plum blossom date and plum blossom period.

When the Meiyu front area and its rain belt reach or form in the middle and lower reaches of the Yangtze River or the Jianghuai area, it is called Meiyu. The period when the rain belt is stagnant or wandering is called Meiyu period; When the rain belt rises northward and reaches the Yellow River basin steadily, and the Jianghuai area is controlled by the western Pacific subtropical high, the plum rain in the Jianghuai area ends, that is, plum blossoms appear.

Baidu Encyclopedia-Chumei

Baidu Encyclopedia-Meiyu Season