China News Service, Beijing, June 1 (Chen Hang) On the 1st, the reporter learned from the Beijing Meteorological Department that Beijing's summer time this year is May 24, the latest in the past ten years.
Beijing (using Beijing Observatory as the representative station) the annual value of summer time (average from 1981 to 2010) is May 19. The Meteorological Industry Standard of the People's Republic of China-"Climatic Seasonal Division" stipulates that the five-day moving average temperature series in the current year is greater than or equal to 22 ℃ for 5 consecutive days, and the first temperature series corresponding to the current year is greater than or equal to 22 ℃ The date is regarded as the summer start date. If the start date of the first judgment is more than 15 days earlier than the normal year, a second judgment of the start date is required.
According to the Beijing Meteorological Department, the daily average temperature monitoring data analysis from the Beijing Observatory shows that the five-day sliding average temperature has exceeded 22 ° C for five consecutive days since May 27. According to the climatic seasonal standard of Beijing entering summer, in the five-day sliding average temperature series (May 23 to 27) corresponding to May 27, the date when the average daily temperature exceeds 22 ° C is May 24, so The time for Beijing to enter summer this year is May 24, the latest time to enter summer in the past ten years.
The picture shows the average daily temperature of Beijing Observatory from May 23 to 31 this year. Photo courtesy of Beijing Meteorological Department
According to reports, in the middle and late May of this year, the mid-high latitudes in the northern hemisphere are meridional circulations, with more cold air activity, and the northeast cold vortex is active. Affected by it, the temperature in Beijing has changed a lot. From May 11 to 25, the average temperature in Beijing is higher than normal The low temperature of 0.2 ° C caused Beijing to enter summer late this year.
In addition, the average length of spring in Beijing's climate is 51 days. This year's time for Beijing to enter spring is March 15 and summer is May 24. The entire spring is as long as 70 days, the longest in nearly ten years.
The Beijing Meteorological Department reminded that although it has entered the summer, the recent heavy rain showers and the large temperature difference between day and night remind people to go out sooner or later to keep warm and guard against colds. Afternoon temperature is high, pay attention to go out to do sun protection and cooling work. (Finish)