High temperature weather generally refers to how many degrees above.

In meteorology in China, when the temperature is above 35℃, it can be called high temperature weather, and if the highest temperature exceeds 35℃ for several days, it can be called high temperature heat wave weather. The standard of high temperature heat wave recommended by the World Meteorological Organization is that the daily maximum temperature is higher than 32℃ and lasts for more than 3 days.

Overview of High Temperature Weather in China Except for some areas such as the Qinghai-Tibet Plateau, high temperature weather has occurred in almost all parts of China, including Mohe in the northernmost part (five high temperature weather occurred in June of 20 10). The high temperature weather in China is mainly concentrated in May -65438+ 10. Geographically, Jiangnan, South China, Southwest China and Xinjiang are places with frequent high temperatures. According to the statistics of 195 1-20 13, high temperature weather has occurred in all cities above the provincial level, except Lhasa and Kunming, and Chongqing has the most frequent occurrence, reaching 2050 days. Xining is the least, only 6 days. China's Xinjiang Basin is also prone to high temperatures, like Turpan, where there are high temperatures every day for a whole month (June, July and August).

What are the hazards of hot weather? The main effects on human health are heatstroke and death caused by cardiovascular and cerebrovascular diseases.

Under the action of excessive ambient temperature, the thermoregulation mechanism temporarily fails, leading to heat accumulation in the body and heatstroke. According to the symptoms and degree of heatstroke, it can be divided into: heatstroke is the mildest manifestation of heatstroke and the most common; Thermal radiation refers to long-term work in a high temperature environment, which leads to vasodilation and congestion of the lower limbs, leading to fainting; Heatstroke is caused by long-term exposure, which leads to perspiration dysfunction.

For patients with hypertension, cardiovascular and cerebrovascular diseases, in the environment of high temperature, humidity, no wind and low pressure, perspiration is inhibited, the stored heat in the body is increasing, and the myocardial oxygen consumption is increasing, which makes the cardiovascular system in a state of tension. The sweltering heat can also lead to vasodilation and increased blood viscosity, which is prone to symptoms such as cerebral hemorrhage, cerebral infarction and myocardial infarction, and may lead to death in severe cases.

High temperature has a certain impact on people's daily life and health and all sectors of the national economy. High temperature weather makes people feel uncomfortable, reduces work efficiency and increases the incidence of heatstroke, intestinal diseases and cardiovascular and cerebrovascular diseases; The demand for water and electricity for heatstroke prevention and cooling has soared, resulting in tight water and electricity supply and frequent failures; Tourism, transportation, construction and other industries will also be affected to varying degrees.

Especially in agriculture, high temperature intensifies soil water evaporation and crop transpiration. When high temperature and little rain occur at the same time, it will cause serious loss of soil moisture, accelerate the development of drought and have a great impact on agricultural production. At the same time, continuous high temperature and lack of rain can easily lead to fires, which will not only destroy the ecological environment, but also endanger the lives and property of the country and people.