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According to the Chinese lunar calendar, Friday falls on the 12th of the 24 solar terms, the Great Heat or Da Shu, which marks the hottest period of the year.
Crops grow their fastest but it's also a time when disasters such as droughts, floods and windstorms are most likely to occur.
Days with temperatures over 35 degrees Celsius will appear more frequently.
Health officials are warning people to pay greater attention to prevent heat related illnesses, by drinking more water and staying cool.
- Hot weather sweeps across Europe 2010-07-09