Guangzhou, located at latitude 2308’N and longitude 11319’E,
is a typical city in hot-humid area of China. Summer is hot and
humid and winter is warm. The mean outdoor air temperature is
28.4 C in July and 13.3 C in January. The relative humidity is
around 83% in summer and 70% in winter. The mean daily
temperature variation is only 7.5 C.