The bar charts illustrate the situation of hot desert climate grasslands between 1980 and 2000, from the aspect of precipitation.
overall, fluctuation had happened among the months, in terms of precipitation in both years, but in 2000, the trend of precipitation has decreased totally.
the precipitation in 1980 was at moderate rate (250 mm) in the first month of the year and hit the highest proportion in march, then it had reduced to approximate range of about 150 mm, in july, and again in the last month of the year, reach to nearly 260 mm.
By surveying the precipitation in 2000, the most proportion had happened in july, august, and november, with same rate of precipitation which were 53mm, that was around 6 times less than the highest rate in 1980. janurary, may, june, and october also have precipitated in similar ranges (51 mm), and other months have a much more negligible rate.
