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Not really that cold. The lost speed stream of fresh ( not salt) water can do this even below -(15-20)C ... The lowest I have ever seen here was -35C. But days below -30C goes not happen every year. And sure only for a very short period, ~1-2 days

Oh Wow! -35!!!! Thats madness!! I stay in South Africa, so we have the opposite here. Right now its about 32C. Its been 42C in some areas last week.