Why is it winter and 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, the sunlight obliquely shines on the earth, and the amount of sunlight received by the earth per unit area decreases, 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 the northern hemisphere is cold; On the contrary, the temperature in the southern hemisphere is much higher than that in the northern hemisphere. So it's also winter, but the weather is very different.