The meteorological validation of the proverb"Cold in the Sanjiu and hot in the Sanfu"
This study analyzes and validates the applicability of the proverb"Cold in the third 9-day before the winter solstice(Sanjiu),hot in the Sanfu"by assessing the probability of occurrence and spatial-temporal distributions of daily mean,minimum,and maximum temperatures across 585 meteorological stations in seven regions of China from 1961 to 2020.The results show that the daily minimum temperatures in China mainly occur within the six periods from"Yijiu"to"Liujiu"period,with the highest probability observed during the"Sanjiu"period,reaching 25.8% .Combining the analysis of daily maximum and mean temperatures,the probability of"hot in the Sanfu"occurrence in China is 61.2% .Owing to latitude and topographical influences,the overall characteristics exhibit higher relevance in central regions and lower relevance in northern and southern regions.
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