I've read that it's not the temperatures in the day you have to worry about, it's the nighttime temperatures. If it's above zero in the day, it mostly glazes the top layer of ice, the long nighttime temperatures is what really makes the ice solid. If the temps rise above zero at night, then the ice really starts melting and you have to watch out.
The sound of the ice cracking is actually supposed to be good as it means that the water is freezing. As water freezes it expands and thus causes the ice to crack as pressure builds, although it is a very unnerving sound.
Others with more experience on the ice might correct me though, I'm always learning the ways of hard water.
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