Why is it hot in summer?

The natural reason for the heat in summer is that the sun has a large altitude angle, and the sun shines directly on the earth, so the energy density of solar energy reaching the earth is high, and the earth gets more energy from the sun, so it is hot in summer. In addition, the summer sun shines directly in the northern hemisphere, and China's positive interests lie in the northern hemisphere. As mentioned above, at this time, the height angle of the sun is large, and the ground gets more solar radiation and the temperature is high. In the northern hemisphere, the days are long and the nights are short in summer, and the heat income is more. In fact, the sun is farther away from us in summer and closer to us in winter.

Because the sun's altitude angle moves to the Tropic of Cancer from summer to the future, the days are long and the nights are short, which leads to high temperature and rain, strong atmospheric inverse radiation and good thermal insulation effect, so it is very hot in summer both in day and at night. Summer is the hottest season of the year in the northern hemisphere. China is used to taking Changxia as long summer, and the meteorological long summer will be postponed to ChangXia Hou for about 25 days.

In summer, the sun shines directly on the Tropic of Cancer, with long sunshine hours, short days and nights, and increased surface heat. On the contrary, in winter, the sun shines directly on the Tropic of Capricorn, with short sunshine time, short days and long nights, and low surface temperature. Between winter and summer, the sun shines directly on the equator, and the length of day and night is equal, so the temperature will not be too high or too low. This is the reason for the temperature difference between winter and summer, which depends on the angle of direct sunlight and the length of sunshine.