Core Points - Shandong province has experienced significantly higher rainfall in September, with an average precipitation of 123.3 mm, which is 154.2% more than the historical average for the same period [2][5] - The rainfall has been frequent, with five major rain events occurring in September alone, leading to a notable increase in the frequency of rainy days compared to previous years [2][6] - Several cities in Shandong have recorded rainfall levels that are among the highest in history for September, with Linyi reaching a record 228.9 mm [5][6] Summary by Sections Rainfall Data - The average rainfall in Shandong from September 1 to 22 is 123.3 mm, which is 78.0 mm more than the same period last year [2][3] - Cities such as Zaozhuang, Linyi, Qingdao, and Heze have seen rainfall amounts that are 2-3 times higher than the historical averages [3][4] Historical Comparison - Linyi's average rainfall of 228.9 mm is the highest recorded for this period, while Zaozhuang and Qingdao also rank in the top three historical averages for September [5][6] - The rainfall levels in several cities have set new records or are among the highest ever recorded for this time of year [5] Weather Patterns - The persistent rainfall is attributed to an unusual atmospheric circulation pattern, where the subtropical high-pressure system has not retreated as expected, leading to a mix of warm and cold air masses [6] - The rainfall in September is characterized by stable precipitation rather than the convective storms typical of summer, resulting in less intense but more consistent rainfall [6]