While Seattle doesn't get that cold during the winter, the combination of 40 degree weather and moisture sure feels colder than it is. And our office is constantly swinging between warm and chilly for some odd reason.
Something else that is important to mention is that young kids can easily slip into a pool or jacuzzi and not make a sound. We might think we would hear a "splash!", but that isn't necessarily true.
I watched my daughter step of the ledge in a jacuzzi once and it was completely silent. One second she was walking and the next she was under water.
Keep your eyes on young children near water at all times. If they are really young and can't yet swim, either be with them or have them wear an approved flotation device. Going under can happen in a split second when your back is turned.
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