Group 1 - The core viewpoint of the articles highlights the unprecedented rainfall and extended rainy season in North China, marking it as the strongest since 1961 [2][6][13] - The North China rainy season began on July 5, 2023, which is 13 days earlier than the average, and lasted for 59 days, significantly longer than the typical 30 days [6][13] - The cumulative rainfall in North China has been exceptionally high, with some areas experiencing rainfall amounts 50% to 200% above the historical average [8][10] Group 2 - The rainfall has led to significant hydrological impacts, with 23 rivers exceeding warning levels, prompting a level IV flood defense response in Sichuan and Shaanxi provinces [1] - The rainfall has caused secondary disasters such as mountain floods and urban waterlogging, while also alleviating drought conditions in some regions [8][10] - The meteorological conditions contributing to this unusual weather pattern include abnormal sea surface temperatures in the equatorial Pacific and strong subtropical high pressure in the western Pacific [15]

Core Insights - The North China rainy season officially ended on September 2, 2023, marking the longest duration and highest cumulative rainfall since 1961, making it the strongest rainy season on record [1][3][19] Summary by Sections Rainy Season Duration and Intensity - The rainy season in North China began on July 5, 2023, which is 13 days earlier than the average, and lasted for 59 days, 29 days longer than usual [3][13] - The intensity of the rainy season was significantly stronger compared to historical averages, with the overall rainfall in North China being the highest since 1961 [3][5] Regional Rainfall Distribution - Since June, the average national rainfall has approached historical levels, but distribution has been uneven, with northern regions experiencing 50% to 200% more rainfall than usual [5][9] - In Tianjin, the average rainfall reached 586.7 mm, which is 40% above the historical average [9] Economic and Environmental Impact - The prolonged rainy season has had dual effects: while it caused flooding and geological disasters in some areas, it also alleviated drought conditions in parts of central and western China, benefiting pasture growth and improving water levels in lakes and wetlands [7][11] - The increased rainfall has affected agriculture, transportation, and tourism, with significant impacts on public perception of weather conditions during peak commuting hours [13][19] Meteorological Factors - The unusual weather patterns are attributed to several factors, including abnormal sea temperatures in the equatorial Pacific and the persistent strength of the subtropical high-pressure system in the western Pacific [14][16] - The geographical features of the Beijing-Tianjin-Hebei region, including the Taihang and Yanshan mountains, contribute to the significant rainfall as warm, moist air is forced to rise, leading to precipitation [16][17] Future Considerations - Meteorological experts note that the duration of the rainy season has shown interdecadal variability, with a trend of increasing duration since 2011, suggesting potential future changes [19]

Core Insights - The 2025 rainy season in North China has set historical records for both duration and cumulative rainfall, marking it as the strongest rainy season since 1961 [1] Summary by Categories Rainy Season Duration - The rainy season began on July 5, 2025, which is 13 days earlier than the average start date, and ended on September 2, 2025, 16 days later than the average end date [1] - The total duration of the rainy season was 60 days, which is 29 days longer than the average duration and ties with 1973 and 2021 for the longest rainy season since 1961 [1] Cumulative Rainfall - The total rainfall during the season reached 356.6 millimeters, exceeding the average by 161.1%, thus setting a new historical high since 1961 [1] - Rainfall distribution showed that areas such as northern Beijing, northern Tianjin, northwestern Hebei, northern Shanxi, and southwestern Inner Mongolia experienced rainfall 1 to 2 times higher than normal, while some areas in southwestern Hebei and Shanxi saw below-average rainfall [1] Temperature Trends - The average temperature during the rainy season was recorded at 24.8°C, which is the fourth highest since 1961, indicating a trend of higher temperatures compared to the historical average [1]

Core Insights - The 2025 North China rainy season has ended on September 2, marking the strongest rainy season since 1961 in terms of duration and cumulative rainfall [1] - The rainy season began on July 5, which is 13 days earlier than the average, and ended 16 days later than usual, resulting in a total duration that is 29 days longer than the average [1] - Cumulative rainfall reached 356.6 millimeters, exceeding the average by 161.1%, setting a historical record since 1961 [1] Rainfall Distribution - Regions such as northern Beijing, northern Tianjin, northwestern Hebei, northern Shanxi, and southwestern Inner Mongolia experienced rainfall that was 1 to 2 times higher than normal [1] - Conversely, some areas in southwestern Hebei and southwestern Shanxi saw below-average rainfall [1] Temperature Trends - The average temperature in the monitored areas was 24.8°C, which is the fourth highest since 1961, indicating a trend of higher temperatures compared to the same period in previous years [1]

Summary of Key Points Core Viewpoint - The 2025 North China rainy season has set historical records in terms of duration and cumulative rainfall, marking it as the strongest rainy season since 1961 [1]. Rainy Season Duration and Rainfall - The rainy season in North China began on July 5, 2025, which is 13 days earlier than the average [1]. - It ended on September 2, 2025, 16 days later than the average, resulting in a total duration that is 29 days longer than usual, tying with 1973 and 2021 for the longest rainy season since 1961 [1]. - The cumulative rainfall reached 356.6 millimeters, exceeding the average by 161.1%, thus setting a new historical high since 1961 [1]. Spatial Distribution of Rainfall - Areas such as northern Beijing, northern Tianjin, northwestern Hebei, northern Shanxi, and southwestern Inner Mongolia experienced rainfall that was 1 to 2 times higher than normal [1]. - Conversely, some regions in southwestern Hebei and southwestern Shanxi saw below-average rainfall [1]. Temperature Trends - The average temperature in the monitored areas was 24.8°C, which is the fourth highest recorded since 1961, indicating a trend of higher temperatures compared to the same period in previous years [1].

Core Viewpoint - The North China rainy season has been notably prolonged this year, lasting 55 days as of August 28, compared to the average of 30 days, influenced by various climatic factors such as sea temperature anomalies and persistent high-pressure systems [1][2][5]. Group 1: Rainy Season Characteristics - The rainy season began on July 5, 13 days earlier than the average start date of July 18, marking the earliest onset since 1961 [2][5]. - Cumulative rainfall in the monitoring area has exceeded the normal seasonal value by 131% as of August 25 [2][3]. - The rainy season has been characterized by high humidity and frequent heavy rainfall events, with 29 significant precipitation events recorded since the onset of the rainy season [3][4]. Group 2: Contributing Factors - Multiple factors contribute to the extended duration of the rainy season, including anomalies in equatorial Pacific sea temperatures, a strong and northward-shifted subtropical high-pressure system, typhoon activity, and geographical features [5][6]. - The subtropical high-pressure system has been particularly strong, reaching its northernmost position since 1961, facilitating the influx of warm, moist air from the south [6][7]. - The interaction between warm, moist air and cold air from higher latitudes has led to increased precipitation in North China [6][7]. Group 3: Climate Change Implications - The record-breaking rainy season is seen as a local manifestation of global climate system changes, with increasing frequency and intensity of extreme weather events attributed to climate change [8]. - Experts suggest that the duration of the rainy season exhibits significant interdecadal variability, with a trend of increasing duration observed since 2011 [7][8]. - There is a call for enhanced disaster prevention and mitigation measures in response to extreme weather, emphasizing the need for societal engagement in climate adaptation strategies [8].

Core Insights - The North China rainy season has been notably prolonged this year, lasting 55 days as of August 28, compared to the average of 30 days, marking the earliest start since 1961 [1][2][4] - The rainy season has been characterized by increased rainfall, with cumulative precipitation exceeding the normal value by 131% as of August 25 [1][2] - Multiple factors contribute to the extended duration and intensity of the rainy season, including abnormal sea surface temperatures in the equatorial Pacific and a strong subtropical high pressure system [4][5][6] Rainfall Characteristics - There have been 29 significant rainfall events since the onset of the rainy season, with 10 classified as strong and 2 as exceptionally strong [2] - Notable rainfall amounts include over 250 mm in certain areas, with specific locations like Beijing's Miyun District recording 573.5 mm and Baoding in Hebei reaching 605.8 mm [2][5] Climate Change Implications - The record-breaking rainy season is seen as a local manifestation of global climate system changes, with increasing frequency and intensity of extreme weather events [6][7] - Experts suggest that the duration of the rainy season may continue to exhibit interdecadal variability, with a trend of increasing duration observed since 2011 [6][7]

Core Viewpoint - The article discusses the unusually long and wet rainy season in North China, highlighting its early onset and significant rainfall, which are attributed to various climatic factors and global warming effects [1][2][3]. Group 1: Rainy Season Characteristics - The rainy season in North China began on July 5, 2025, which is 13 days earlier than the average start date of July 18 [2]. - As of August 21, the average rainfall in the North China monitoring area reached 315.5 mm, which is 131% higher than the normal value of 136.6 mm [2]. Group 2: Contributing Factors - The increased rainfall is linked to several factors, including abnormal sea temperatures in the equatorial Pacific, a strong and shifted subtropical high-pressure system, typhoon activity, and geographical influences [3][4]. - The subtropical high-pressure system has been notably strong and positioned further north than usual, facilitating the transport of warm, moist air to northern China [3]. Group 3: Geographical Influence - The geographical features of the Beijing-Tianjin-Hebei region, including the Taihang and Yan mountains, enhance precipitation through orographic lift, which promotes condensation of moisture [4]. - The combination of topographical effects and weather systems significantly increases rainfall efficiency in the region [4].

Core Insights - The article discusses the unusually long and wet rainy season in North China, which began on July 5, 2023, 13 days earlier than the average start date of July 18, marking the earliest onset since 1961 [1][2] - The average rainfall in the North China monitoring area reached 315.5 mm, which is 131% higher than the normal value of 136.6 mm [2] - The record-breaking rainfall is attributed to multiple factors, including abnormal sea temperatures in the equatorial Pacific, a strong and shifted subtropical high-pressure system, typhoon activity, and geographical influences [3][4] Summary by Sections Rainy Season Characteristics - The rainy season in North China has lasted for 52 days as of August 25, significantly longer than the typical duration of 30 days [1] - The rainy season is characterized by increased rainfall frequency, volume, and humidity, contributing to a notably damp environment [2] Factors Contributing to Abnormal Weather - The subtropical high-pressure system has been stronger and positioned further north than usual, facilitating the transport of warm, moist air from lower latitudes to northern China [3] - Historical data indicates that the combination of typhoons and the subtropical high can lead to extreme rainfall events, as seen with Typhoon "Kanu" and Typhoon "Zhu Jie Cao" [3] Climate Change Implications - The record rainfall in North China is viewed as a local manifestation of global climate system changes, emphasizing the need for improved climate adaptation and response capabilities to address extreme weather challenges [4]

Core Viewpoint - The northern regions of China, particularly North China, are experiencing an unusually prolonged rainy season, with significant rainfall exceeding historical averages, attributed to various climatic factors [2][3][4]. Summary by Sections Rainfall Patterns - The rainy season in North China began on July 5, 2023, which is 13 days earlier than the average, marking the earliest start since 1961 [2]. - As of August 25, 2023, the cumulative rainfall in the monitoring area of North China was 131% higher than the average [2]. Climatic Influences - The excessive rainfall is linked to abnormal sea temperatures in the equatorial Pacific, a strong and shifted subtropical high-pressure system, typhoon activity, and geographical factors [3]. - The subtropical high-pressure system has been notably strong and has shifted northward, allowing for continuous moisture transport from the ocean to northern regions [3]. Weather Systems and Topography - The influence of Typhoon "Zhu Jie Cao" has contributed additional moisture to North China, enhancing rainfall [4]. - The topographical features, such as the Taihang and Yanshan mountains, have caused forced uplift of warm, moist air, leading to increased precipitation through condensation and convection [4]. Climate Change Context - The record-breaking rainy season is seen as a localized manifestation of climate change, highlighting the need for improved climate adaptation and response capabilities to handle extreme weather events [4].