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].