This study used meteorological data compiled at the
weather observatory of each city from 2003 to 2009. In
these data, precipitation (mm) and wind speed (m/s)
were reported. For precipitation, total daily precipitation
was calculated. In cases where there were several observatories
in a subject area, average daily precipitation
recorded by each observatory was calculated, and then
used as daily mid-level of each area. For wind speed,
daily highest wind speed was calculated. Where there
were several observatories in a subject area, an average
daily highest wind speed was calculated, and then used
as daily mid-level of each area.