The annual mean SCD over the TP from 2001 to 2011 is further studied using ground-based observation data from 98 meteorological stations with nonmissing data to evaluate the accuracy of the temporal variations of snow cover from MODIS snow data products (MOD10A2). As illustrated by the MODIS snow cover data above, the spatial variability of SCD on the TP is remarkable from the low altitudes to the high mountain regions. In some high-altitude places such as Qingshuihe, Chali, Shiqu, Whshaoling, and Dari stations located in the interior of the TP, the annual mean SCD reaches above 100 days, and the maximum SCD on the TP is found at Qingshuihe station with a total of 145 days. In contrast, SCD in Batang, Muli, and Gongshan stations in the southeastern TP and Lhatse, Shigatse stations located in the middle regions of the Yarlung Zangbo valley, is less than 3 days. Therefore, the averaged annual mean SCD on the TP is relatively short with 31 days. The slightly decreasing trends in the SCD are found from 2001 to 2011, but this is not statistically significant. In detail, the SCD is in increase from 2001 to 2008 and is above or equal to the average from 2001 to 2011 except for 2007 which has only 26.5 days. The decrease in SCD is more obvious during the period from 2008 to 2011, with less than the average from 2001 to 2011 for the most of the years. Particularly, the SCD in 2010 is 21.5 days which is lower by 9.5 days than the average, which is the minimum value from 2001 to 2011 at an annual level. Compared to 2010, there is a small increasing trend in the SCD in 2011, reaching to 28.8 days, but it is still lower than the average from 2001 to 2011. As shown in Fig. 7, it is clearly visible that 2002, 2005, and 2008 are relatively snowy years, and 2001, 2003, 2007, and 2010 are less-snow years both on the basis of the SCD and SCA. It should be noticed that since all these meteorological stations are located in relatively lower elevations and valleys, the resulting SCD should be treated as the lower end of the SCD for the entire TP. However, the interannual change patterns mapped by those stations should be representative of the SCD change for the entire TP.