Dimictic lakes are
holomictic lakes that mix from top to bottom during two mixing periods each year. During winter they are covered by ice. During summer they are thermally stratified, with temperature-derived density differences separating the warm surface waters (the
epilimnion), from the colder bottom waters (the
hypolimnion). Mixing typically occurs during the spring and autumn, when the lake is "isothermal" (i.e., at the same temperature from the top to the bottom). At this time the water throughout the lake is about 4°C, and, in the absence of any temperature or density differences, the lake readily mixes from top to bottom. These lakes are common in regions with temperate climates.
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Lakes and reservoirs that freeze over and normally go through two stratifications and two mixing cycles a year.
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