On the Climatological Characteristics of Chilly Temperature and Frosty Days in Xinxing County from 1971 to 2021
Based on the data of daily air temperature from a national meteorological station in Xinxing from 1971 to 2021 and with the methods of linear tendency analysis,polynomial fitting,Mann-Kendall ab-ruptness test and wavelet analysis,this paper studied the climatological characteristics of chilly temperature and frosty days in the county.The result is shown as follows.The annual average numbers with chilly tem-perature and frosty days were 10.5 and 4.8 d respectively,which were decreasing significantly at the rates of 0.2 and 0.1 d per year respectively.These numbers were larger in the 1970s and 1980s than in the 2010s.They were the most in January and December but the least in March.They decreased abruptly around 2010.Multiple nested structure and abrupt changes were found on the scale of temporal period.
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