How can water evaporate from a pool in the summer when it is supposed to evaporate at 100°C ?
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It boils at 100 but evaporates at any temperature. The water is not all at the exact same temperature. The molecules zip around and crash into each other constantly. So each molecule can be far bellow zero in one moment and then far above boiling in another moment as other molecules have bumped into it. This means that at any point in time there are lots of molecules at the surface of the water which have a higher then boiling temperature. And these will be able to escape into the atmosphere. This is called evaporation. The higher the temperature the faster the evaporation.
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