Beijing officially transitioned into meteorological summer on May 26, six days later than the average annual start date of May 20. The city has since experienced steadily rising temperatures, with thermometers consistently exceeding 30°C this week. Forecasters predict a potential peak of 35°C on June 5, which could mark the first high-temperature day of the year, prompting public health warnings about heat prevention measures.
Summer Conditions Establish Firm Footing
The final days of May witnessed a dramatic shift in Beijing’s weather patterns, replacing mild spring conditions with intensifying heat. From May 27-29, daily highs remained above 31°C, with May 30 approaching 30°C. The sudden temperature surge transformed urban fashion as short sleeves and summer dresses became ubiquitous across the city’s streets.
Scientific Determination of Seasonal Transition
According to China’s National Standard for Climatic Season Classification, meteorological summer begins when the first date in a series of five consecutive days with a moving average temperature ≥22°C is identified within a corresponding nine-day sequence of daily average temperatures. Data from Beijing’s benchmark Nanjiao Observatory confirmed the threshold was met, with the moving average temperature first reaching ≥22°C on May 28 and maintaining this level for five consecutive days by June 1. The corresponding initial ≥22°C reading occurred on May 26, establishing this as the official summer commencement date.
Extended Spring Season Noted
This year’s delayed summer onset followed an unusually early spring beginning on March 19—one week ahead of schedule—resulting in a 68-day spring duration. This ranks as the third longest spring season Beijing has experienced in the past two decades, granting residents an extended period of moderate temperatures before the summer heat.
Sustained Heat Expected
Meteorologists anticipate continued summer conditions in the coming days, with temperatures persistently above 30°C. The forecasted 35°C high on June 5 may trigger Beijing’s first official high-temperature day of 2025, prompting authorities to remind residents to implement appropriate sun protection and cooling measures during peak heat hours.
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