during the summer months de-stratify during cooler windier weather, with surface mixing by wind being a significant driver in this process. This is often referred to as "autumn turn-over". The mixing of the hypolimnium into the mixed water body of the lake recirculates nutrients, particularly phosphorus compounds, trapped in the hypolimnion during the warm weather. It also poses a risk of oxygen sag as a long established hypolimnion can be anoxic or very low in oxygen.

Lake mixing regimes can shift in response to increasing air temperatures.