We’re lucky in Scandinavia that most winters are mild enough that we can fish through them. It happens every now and then the it’s cold enough to put a lid on, even in the salt. The shallower areas, where there isn’t much current (yet often good fishing) can freeze over and the same of course goes for our lakes. But even with very cold water, there’s always a chance. It’s slim, but if you never buy a lottery ticket you never win.