The monthly mean temperature at 137 stations in China in present century are classified into five grades 1-5. Maps of grade distribution have been prepared for every month and year.
将本世纪以来我国137个站每个站逐月的月平均气温划分为五个等级，绘制了全国范围的历年逐月温度等级分布图。
In the 1990s, the flood water level was lower than before at most stations in the river network of the Pearl river delta under the same grade of runoff.
90年代以来，珠江三角洲网河区大部分水位站同级流量的洪水位普遍下降的同时，局部河段洪水位却异常壅高。
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