When is the rainy season in Guangzhou?

What month is the rainy season in Guangzhou?

A: Generally speaking, the rainy season in Guangdong is in April, May and June.

Meiyu refers to a period of continuous rainy weather in the middle and lower reaches of the Yangtze River in China from mid-June to mid-July every year. At this time, the utensils are easily mildewed, so they are also called "mildew rain", and when the plums in the south of the Yangtze River are yellow, they are also called "plum rain" or "Huang Meiyu". The time that the rain belt stays is called "Meiyu season", the day when the rainy season begins is called "entering the plum blossom", and the day when it ends is called "emerging the plum blossom".

The main characteristics of Meiyu:

1. The unique weather and climate phenomenon in East Asia is the product of the periodic activities of the East Asian summer monsoon.

From February to July, it mainly appears in the area from Jianghuai Valley in China to South Korea and Japan.

3. The annual average amount of plum rains in the Jianghuai Basin exceeds 300mm, accounting for 30%-40% of the total annual precipitation.

4. Meiyu has obvious interannual and interdecadal variation characteristics and obvious regional characteristics.

According to the "Regulations on Meiyu Monitoring Business" issued by China Meteorological Bureau, the newly stipulated Meiyu area:

Meiyu in Jianghuai basin is divided into three areas: Jiangnan area, middle and lower reaches of Yangtze River and Jianghuai area for monitoring. Including: Shanghai, Jiangsu, Anhui, Zhejiang, Jiangxi, Hubei and Hunan.

Three main criteria for monitoring Meiyu:

First, the temperature

Meiyu first began in late May and occurred in high temperature and high humidity environment, with an average daily temperature of ≥22℃.

Significance: The seasonal attribute of Meiyu-summer is determined.

Second, the location of subtropical high ridge

The subtropical high jumps northward, and the position of the subtropical ridge line should be between the southern boundary and the northern boundary of Meiyu area.

Significance: The spatial attribute of Meiyu is determined-6 provinces 1 city in the middle and lower reaches of the Yangtze River.

Third, the rainy days in the rainy season.

When there are more than 65438 monitoring stations in the monitoring area with a daily precipitation of ≥0. 1/3, and the average daily precipitation in this area is ≥ 0.2mm, it is regarded as rainy day. ..

From the 1 (the last 1) rainy day, if the next (previous) 2, 3, ... and the 10 day ≥ 50% of the total days in the same period, the first rainy day is the start (end) day of the rainy season.

Significance: The rainfall attribute of Meiyu is certain-the rainfall should reach a certain standard.

Weather characteristics in Meiyu period

Continuous rain, high temperature and high humidity. After the Meiyu ended, the rain belt moved to North China, and the Jianghuai basin entered high temperature and little rain.

Normal Meiyu and Abnormal Meiyu

The average normal meiyu in the middle and lower reaches of the Yangtze River starts in mid-June and ends in mid-July, lasting more than 20 days.

But for each specific year, the beginning and end of meiyu and the intensity of meiyu are very different. As a result, plum rains are obvious in some years, not obvious in some years, and even empty plums appear.

Meiyu has multiple personalities such as complexity, diversity, asymmetry and importance, and has obvious interdecadal and interannual changes. The time scale of Meiyu season from weekly scale to sub-seasonal scale has become an important weather and climate phenomenon at the junction of meteorology and climatology.

Source:/2011xwzx/201xqxxw/201xtpxw/201706/t201.