When cold weather sets in and temperatures sink to lower than 20 degrees below zero, the ice cover grows by up to 5 cm in the first three to four days.
The entire expanse of Baikal usually freezes over by around January 15 to 20, but in the rare event of a mild winter, it can happen up to a month later.
Only Baikal’s northern part had frozen by mid-January, with ice floes formed in its middle. The southern part is expected to freeze over by the end of the month.
The lake’s southern part remains covered with ice for up to four-and-a-half months, while the northern part is usually frozen for up to six-and-a-half months.
Hard frosts cause cracks to form in the ice, creating separate ice floes. As the ice breaks up, it makes a loud cracking sound resembling thunder or cannon shots.
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