Why does the Big Dipper belong to the starry sky in spring, but it can tell the seasons?

It is relative, not absolute, to say which constellation belongs to which season.

The Big Dipper belongs to the constellation Polaris, which is not far from the north celestial pole and rotates around Polaris all the year round. It is difficult to see the Big Dipper in the southern hemisphere. In the middle and high latitudes of the northern hemisphere, you can see the Big Dipper all year round, and the only difference is the height, angle and position.

In spring, the Big Dipper has the highest position and the largest altitude angle, which is easy to be observed, so it is listed as a spring constellation. But even in autumn, you can see the Big Dipper, but the height angle is very small and the position is very low. You can easily see it at high latitudes in the northern hemisphere, but it is not easy to see it at low latitudes near the horizon.