用１９６１～１９９５年宣城秋季地面气象要素资料统计分析，得出：（１）寒露风出现日期为多波振动的年际变化模式，并存在准４ａ周期的低频振荡；（２）日平均气压与水汽压有准２０ｄ周期的变化现象；（３）温压时间演变曲线，由高温低压逐渐演变到高压低温，两曲线交点后２ｄ出现寒露风。 From the statistical analysis of ground meteorological elements data of Xuancheng from 1961 to 1995, we can draw the following conclusions: (1) The appearance of cold and dew wind is interannual variation of multi-wave vibration with low-frequency oscillation of quasi-4a period; (2) And vapor pressure 20d period quasi-change phenomenon; (3) evolution of temperature and pressure time curve, gradually evolved from high temperature and low pressure to high pressure and low temperature, the two curves after the intersection of 2d appeared dew wind.