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Temperature varies in ponds and lakes seasonally. During the summer, the temperature can range from 4Â° C near the bottom to 22Â° C at the top. During the winter, the temperature at the bottom can be 4Â° C while the top is 0Â° C (ice).
Best Answer: Pond turnover may occur at any time of the year. However, one of the most common times is in late summer when the water is very warm and oxygen demand is already high. Turnover is often caused by a sudden cooling of weather and a cold rain which cools the water close to the surface. The cool water on top is more dense than the warmer water below and causes the pond to turnover. Turnover often releases anoxic water from the bottom, which causes a lack of oxygen throughout the pond.