Underwater structure and the lake's geography determine the areas that warm most quickly. Shallow bays with exposure to the southern skies (usually those on the north side of lakes) warm the fastest.
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Because water warmer than 40oF is more buoyant than cooler water, spring warming creates a shallow, warmer layer of water late in the day on the downwind side of a lake. Other factors being the same, the north side will warm more quickly than the south side of the lake.
Lakes have layersWater temperatures also play a role in water density. Warm water is less dense meaning it is lighter and stays toward the top of the lake. The colder, heavier water is found at the bottom.
The seasons at a glanceTop tip: In the bleak mid-winter, when it's really cold and settled, go for the bottom half of the middle third, occasionally rising up in the water if the day is bright. The lake warms up from the surface downwards, slowly heating all the way through the water column.
The colder water is, the more oxygen it can hold. As the water becomes warmer, less oxygen can be dissolved in the water. Salinity is also an important factor in determining the amount of oxygen a body of water can hold; fresh water can absorb more oxygen than salt water.