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。
The annual mean temperature was 23.4 degrees, making 1997 the fourth-warmest year on record.
而全年平均气温则达23.4度，是历年第四最高纪录。
The annual mean temperature was 23.4 degrees, making 1997 the fourth-warmest year on record.
而全年平均气温则达23.4度，是历年第四最高纪录。
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