What are the main reasons for the high temperature weather when the temperature exceeds 40℃ in many places?

Hello, I'm Lucy, the adult of life, and I'm glad to serve you!

The main causes of high temperature weather include the following aspects:

The change of the earth's climate: global climate change leads to the continuous rise of temperature, so the frequency and duration of high temperature weather will also be extended.

Intensified greenhouse effect: human activities lead to a large number of greenhouse gas emissions, of which carbon dioxide is one of the main greenhouse gases, which makes the earth's atmosphere absorb more solar radiation and lead to an increase in temperature.

Less heavy rain: less heavy rain leads to land drought, soil lacking moisture can't adjust the temperature, and dry air can also raise the temperature.

Influence of high-pressure system: In summer, the frequent appearance and long-term existence of high-pressure system will lead to continuous high-temperature weather.

Topographic factors: Topographic factors can also affect the climate. For example, urban construction and large-scale landscaping will change the characteristics of urban climate, affect air flow and heat dissipation efficiency, and thus lead to the emergence of high temperature weather.

I hope my answer can help you!