It is rare for high temperatures in the north to overlap multiple times. Since the beginning of this year, the number of high temperature days in China has reached a new historical high

Since the beginning of this year, China has had the highest number of high-temperature days in its history since 1961. There have been a total of four regional high temperature processes across the country, characterized by early onset, wide impact range, and significant extremes.

The most prominent high temperature phenomenon occurred in June in North China and the Huanghuai region, with Beijing having the highest number of high temperature days since 1961, followed by Hebei and Tianjin. The average temperature in June in the four provinces of Beijing, Tianjin, Hebei, and Xinjiang was the highest in history during the same period.

The Central Meteorological Observatory predicts that in early July, there will still be high temperatures in the eastern part of North China and the northern part of the Yellow River and Huaihe River. Among them, from the 1st to the 2nd, there will be significant high temperatures in North China, Huanghuai, Fenwei Plain and other areas, with some areas reaching a maximum temperature of 40 ℃. On the 5th and 8th, there will be a sustained high temperature process in North China, Huanghuai and other areas. In addition, from June to September, there will be high temperatures in the eastern part of Jiangnan and the eastern part of South China.

The National Climate Center predicts that this summer, there will be periodic high temperature processes in North China, Central and Southern China, and Northeast Southwest China.

Since the beginning of this year, China has had the highest number of high-temperature days in history compared to the same period

Since the beginning of this year, the average number of high temperature days in China has been 4.1 days, which is 1.9 days more than the same period in previous years and the highest in history since 1961. Compared with the same period throughout the year, the eastern part of North China, the northern part of East China, the western part of South China, the southern part of Southwest China, the southern part of Xinjiang, and the western part of Inner Mongolia have an extra 5-10 days, and some areas have an extra 10 days.

Annual variation of national average high temperature days from January 1st to June 30th

Abnormal distribution map of high temperature days in China from January 1 to June 30, 2023

Since the beginning of this year, China has experienced four regional high temperature processes, namely from May 28th to June 5th, June 6-12, June 14-17, and June 21-30. 301 national meteorological stations across the country have reached the extreme event standard for daily maximum temperatures, with 110 stations including Qiaojia and Yuanmou in Yunnan, Tanghekou in Beijing, and Langfang in Hebei reaching or breaking historical extremes. From May 28th to June 5th, China experienced its first regional high temperature process this year, 16 days earlier than usual, mainly affecting 15 provinces and cities including Shanghai, Yunnan, Sichuan, Anhui, and Guangdong.

Since June, there has been a significant increase in the number of hot days in North China, with extreme high temperatures occurring frequently in many areas

Since June, the number of hot days in North China has been 9.8 days, which is 5.2 days more than the same period in normal years, making it the fourth highest in history since 1961. Beijing has the highest number of hot days in its history since 1961, followed by Hebei and Tianjin, and Shandong.

The two regional high temperature processes on June 14-17 and June 21-30 mainly affected the North China region. From June 14th to 17th, 44 national stations in North China had the highest temperature reaching or exceeding 40 ℃, with a coverage area of 371000 square kilometers of high temperatures above 35 ℃, including 17000 square kilometers of high temperatures above 40 ℃, affecting a population of over 200 million people.

On June 21-30, China experienced its fourth regional high temperature process this year, the strongest since the beginning of the year. The extreme high temperature in North China is strong, with 22 stations including Tanghekou in Beijing and Dagang in Tianjin reaching or breaking historical extremes, and 124 national stations exceeding 40 ℃. On the 22nd and 24th, the temperature at the Beijing Southern Suburb Observatory reached or exceeded 40 ℃ for three consecutive days, with the urban area experiencing temperatures exceeding 40 hours. The highest temperature at the Observatory on the 22nd reached 41.1 ℃.

In the past decade, a total of 10 regional high temperature processes have occurred in North China. Except for 2014 and 2015, there has been a high temperature process occurring in June every year in North China for the past 10 years, but the repeated occurrence of high temperatures is rare in history. From multiple indicators, the comprehensive intensity of the high-temperature process from June 21 to 30 this year is the strongest since the beginning of this year, and the extreme intensity is also the strongest in June of the past decade.

North China, Huanghuai and other regions will also experience multiple heatwaves

The Central Meteorological Observatory predicts that in early July, there will still be high temperatures in the eastern part of North China and the northern part of the Yellow River and Huaihe River. Among them, from the 1st to the 2nd, there will be obvious high temperature weather in North China, Huanghuai, Fenwei Plain and other areas, and the highest temperature in some areas can reach 40 ℃. On the 5th and 8th, there will be a sustained high temperature process in North China, Huanghuai and other areas. In addition, from June to September, there will be high temperatures in the eastern part of Jiangnan and the eastern part of South China.

The National Climate Center predicts that this summer, the temperature in North China, Central and Southern China, and Northeast Southwest China will be 1-2 ℃ higher than the same period in previous years, and there will be periodic high temperature processes.