Mean Annual Rainfall

Precipitation is "average annual", and is expressed in terms of millimeters (mm.) per year; Average Days of Precipitation ("Wet Days") is number of days per year; and Average Windspeed is expressed in terms of meters per second (note that this is not maximum windspeed, nor is there any directional content included in this data set). It is GRID's assumption that the definition of a "wet day" is one in which enough precipitation occurred on a given day so as to be recordable by a gauging station at a particular location.

降水量采用年均值，单位为毫米（mm）/年；降水日数(Wet Days，亦称"雨日")指每年内的降水总天数；平均风速单位为米每秒（注：本数据集未包含最大风速数据，亦无任何风向相关信息）。GRID默认"雨日"的定义为：某一特定日期的降水量达到对应地点降水观测站可记录的阈值。