抄録
The global warming proceeds recently, because of increasing greenhouse gases emitted in the atmosphere by human activities. The global warming may change the local climate that is an important factor in our residential environment. With the global warming, the annual average temperatures are rising in almost all Japanese observatories, while the other weather variables have not been changing obviously. In particular the rainfall at any area is not recognized to be changing or to have any tendency in recent year. However, in this study, we investigate the AMeDAS data to consider the characteristics of the rainfall in Japan. One of the results in this investigation is that the annual average rainfall does not have a significant tendency, while there is a decreasing tendency in no rainfall days and an increasing tendency in weak rainfall (0-1mm ) days almost all over Japan after 1980 to 2010.
