Regional Characteristics of Temperature Reductions with the Occurrence of Precipitation in Summer over the Kanto District

Abstract

The purpose of this study was to clarify regional characteristics of reductions in temperature when precipitation occurs in summer over the Kanto district. The standard deviation of temperature at the time of precipitation occurrence was greater in southern Kanto than in northern Kanto. In many cases in southern Kanto, temperature reductions occurred over a wide area when precipitation coincided with the afternoon high temperature and the midnight low. In the case of convective precipitation, temperature differences before and during precipitation were related to rainfall intensity. Furthermore, 5 to 8 hours were required for the decrease in temperature due to precipitation to return to the diurnal temperature variation of sunny days. Sunshine before precipitation occurrence, precipitation intensity, and time of precipitation occurrence contributed to variations in the standard deviation of temperature in both southern and northern Kanto.