Why is the lake turbid in summer and clear in autumn?

It turned out that summer came, and there was more rain. A lot of rain washed the ground and washed sediment and many dirty things into the lake, and the lake was naturally turbid. At this time, the water with higher water temperature is irrigated, and microorganisms take the opportunity to grow and reproduce, so the lake in summer is turbid.

When autumn comes, there is much less rain than in summer. Without the rain scouring the ground, sediment and dirty things will not flow into the lake, but the sediment in the original lake will slowly sink to the bottom for a long time, and the water temperature will become cold in autumn, so that some water irrigation and microorganisms can not continue to grow and reproduce, and the lake will be clearer in autumn.