It's far too cold to freeze. The thermocline effect causes cold water that would normally freeze in a shallower loch to descend lower in the loch and be replenished by warmer water from below. There is enough water for this to continue continually, so the surface will never freeze all the way across.
The average depth of Loch Ness is about 25 feet (7.6 m), with a maximum depth of 105 feet (32 m). The deepest part of the loch is called Hells Deep Shelves, which measures 98 feet (30 m) below sea level.
Loch Ness is one of many lakes in the Scottish Highlands and Islands. It has an area of 1,290 acres (527 ha). The lake is connected to the Atlantic Ocean through the River Ness. It is also connected to the North Sea by the Strait of Maelstrom. The only outlet for the lake is via the River Ness, which flows into the North Sea.
Loch Ness is famous for its mysterious monster sightings. In fact, it is one of the most searched-for creatures on Google Earth! There are actually several monsters that have been seen in the lake over the years: the Nessie, which is probably the most well-known one; the Slug Monster; and the Dragon Snake.
There have been many attempts to capture the monster on film, but without success.
Winters in Scotland can be brutally cold, but don't expect Loch Ness to freeze. Because of the thermocline effect, the water is constantly replenished with warmer water from the lake's deeper layers. Surprisingly, if you take a winter tour of the Highlands, you may even witness steam rising from Loch Ness.
The cold water at the bottom of the lake keeps the warmer water closer to the surface from freezing. The constant turnover of heat causes the average temperature of the water to remain around 10 degrees Celsius all year round.
In fact, some scientists believe that parts of Loch Ness are actually connected to larger bodies of water in Europe or North America and they drain into it during heavy rain. During dry periods, the level of the lake drops because there's no pointy stick to poke it underground for drainage as long as there are trees above it!
They also think that the deep channels between islands may provide routes for water to flow between lakes, which would cause areas of the loch to warm up during periods of drought.
You might wonder what happens when it doesn't freeze? Scientists have studied how the ice affects the environment of Loch Ness, because without any fish or plants to support, would it be an intact ecosystem?
The weight of the ice can cause damage to surrounding land, but because the lake is so large, these effects aren't significant.
Loch Ness is supposed to never freeze and to stay at the same temperature of roughly 4 °C all year. It is the greatest body of water on the Great Glen Fault and holds more fresh water than all of the lakes in England and Wales combined. These factors make it important for scientists to know how much water is in Loch Ness.
The amount of water in Loch Ness has been estimated from time to time since 1650, when it was first measured. The most recent estimate, which includes additional water due to climate change, is that there is about 595 million cubic meters (20 billion ft3) of water in Loch Ness. This is enough water to cover the lake to a depth of about 2.5 m (8 feet)
Some people think that because there are no large islands in Loch Ness that everything that disappears under the surface must still be there. But this is not true. Some things do get lost under the surface, such as fish scales and wood from trees that have been drowned over time.
It is possible to lose matter under the surface if it's not made of solid particles. For example, if you throw a stone into a pond, it will eventually disappear under the surface. This is because there's nothing to keep it down there so it floats up again when the next high tide comes in.