Spatial-Temporal Variation of the Snow Cover in Heilongjiang Province in 1951—2006

In this paper,the spatial and temporal characteristics of snow cover in Heilongjiang Province are analyzed by using the snow cover data of Heilongjiang Province for the period 1961-2005. It is found that:There are 5.5 months having snow cover on an average. The beginning date of snow cover in north is one month early than that in south. The ending date of snow cover in north is 1.3 month late than that in south. Temporally,the beginning date of snow cover is retreating by 1.9 d·(10a)-1 and the ending date of snow cover is advancing by 1.6 d·(10a)-1. The retreat and advance take place mainly in the plains of lower latitude.