What do you mean by "plum blossom"? Why did you call May?

Plum blossom, also called plum blossom break, refers to the end date of rainy weather 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. The rainy days in the whole region are less than 2 days, and the maximum temperature of each station in the whole region has obviously risen above 30℃, and the surface southerly wind speed has obviously accelerated. In other words, plum blossom will occur between July 8 and 19, and the plum blossom period will be delayed in some years. After the rainy season, most areas have entered the hot summer season.

Extended data

In June and July, it was 125- 140 on a 500mb map in the northern hemisphere. The position of the ridge line of the western Pacific subtropical high at E: 23-24 in southern Zhejiang. N, the north of Zhejiang is on 24-25. And is stable for five days or more. After continuous rainy days, there is basically no rain for seven days or more in southern Zhejiang and five days or more in northern Zhejiang (excluding precipitation caused by tropical system in the south and local geothermal thunderstorms). The average daily temperature is stable at 25 degrees. C or 25. Above C.

The daily average temperature and pressure time curve of a single station have increased synchronously. If the subtropical ridge has jumped northward to 25. N, and stable for two hours, during which the continuous rainy weather is still greater than or equal to 0. 1 mm, then all days with daily rainfall greater than or equal to 1.0 mm are selected. 120- 130 after the rainy season. The ridge line of subtropical high between E jumps northward to 26. N or its north, and the daily average temperature is ≥27. C, the highest temperature is 330. C, and there is no rain for more than 6 consecutive days.

The average annual flowering date of plum blossoms is July 9. When the ridge line of subtropical high jumps northward to 26. North of N and stable for more than 3 days, the peripheral line of subtropical high (588dagpm) controlled Hankou for more than 2 days, and the last provincial precipitation process ended, which was designated as Meihua.