Ice always melts at 32 degrees F, but water does not always freeze at 32%B0F. It must freeze onto something. However, at -40 degrees F ( which is -40 degrees C), water freezes spontaneously. If you poured a cup of water out of a window with the air temperature outside at -40 degrees F, the water would freeze before it struck the ground.
Ice starts to form in pools of water at about +4 degrees C. Once the water reaches 0 degrees C (32 degrees F), it will start to freeze on the surface, forming a sheet of ice which insulates the rest of the water, so it tends not to get any colder.
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