How fast does ice form on lakes?

Ice will increase at a rate of 1 inch/15 freezing degree days. For example, if the average temperature over the last 24 hours was 25 degrees, subtract that from 32 degrees which will give you 7. Put 7 over 15 like a fraction, 7/15 equals about a 1/2 inch of ice over a 24-hour period.



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ice in lakes and rivers, a sheet or stretch of ice forming on the surface of lakes and rivers when the temperature drops below freezing (0° C [32° F]).

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This general gauge gives safe ice thicknesses to support different types of activities: Less than 4 inches: Stay off the ice. 4 inches: Walking, ice fishing, ice skating, or other activities on foot are permitted. 5 to 7 inches: Snowmobiling or riding ATVs are safe.

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In water that is around the freezing point, a person is likely to survive only 15 to 45 minutes with flotation and possibly up to an hour or so with flotation and protective gear before the brain and heart stop (Table 1). The surface temperature of Lake Superior in early to mid-summer is about 40 to 50 F.

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If you can see the ground through the ice, then there's going to be warmer water under it. Out in the middle, the ice grows thicker over the cold dark depths. Also, ice always melts away from the shore first.

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Most lakes and ponds don't completely freeze because the ice (and eventually snow) on the surface acts to insulate the water below. Our winters aren't long or cold enough to completely freeze most local water bodies. This process of lakes turning over is crtically important to the life in the lake.

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Because the ice acts like the glass in a greenhouse, the water beneath it begins to warm, and the ice begins to melt FROM THE BOTTOM.

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