Why is it winter, but the weather is different?

Because in winter, the direct point of the sun is in the southern hemisphere, the height angle of the sun is small, and the sunlight shines obliquely on the earth, so the amount of sunlight received per unit area of the earth is reduced, that is to say, the energy density of solar energy reaching the earth is small, and the earth gets less energy from the sun, so it is cold in the northern hemisphere; On the contrary, the temperature in the southern hemisphere is much higher than that in the northern hemisphere. So it is also winter, but the weather is very different.