中国北方地区寒潮时空特征及其成因分析
乔雪梅, 刘普幸

The temporal and spatial characteristics and genesis of cold wave in northern China
Xuemei QIAO, Puxing LIU
表3 北方地区各月近58年寒潮频次总和
Table 3 Monthly frequency distribution of average cold waves in northern China from 1960 to 2017
月份123459101112
频次/次21.117.215.820.67.53.215.831.227.2