The standard of high temperature heat wave is mainly based on the influence or harm degree of high temperature on human body. Except the Northeast and Qinghai-Tibet Plateau, there is little or no high temperature weather in the whole country, and other areas will have different degrees of high temperature weather.
Annual high temperature days 10~20 days in eastern and southern North China, western Huanghuai, middle and lower reaches of the Yangtze River, southern China (except coastal areas), southern Yunnan, central and southern Xinjiang, northwestern Inner Mongolia, and more than 30 days in eastern South Xinjiang Basin.
High temperature is also a common meteorological disaster, which has a certain impact on people's daily life and health as well as all sectors of the national economy. High temperature and heat wave make people uncomfortable, work efficiency is low, and the incidence of heatstroke, intestinal diseases, cardiovascular and cerebrovascular diseases increases; The demand for water and electricity for heatstroke prevention and cooling has soared, resulting in tight water and electricity supply and frequent failures.
High temperature aggravated soil water evaporation and crop transpiration. When high temperature and little rain occur at the same time, soil moisture is seriously lost, which accelerates the development of drought and has a great impact on agricultural production.
Continuous high temperature and little rain are also easy to cause fires, and forest fires will destroy the ecological environment. In addition, tourism, transportation, construction and other industries will also be affected to varying degrees, but the high temperature heat wave will also bring business opportunities to some manufacturers and businesses that produce and sell heatstroke prevention and cooling supplies and equipment.