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It is sarcasm, and has nothing to do with snorkeling. The phrase simply means that the weather is horrible. Therefore snorkeling would infact be impossible, unless you wanted to freeze yourself to death.
"Wow, with all this ice, its great weather for snorkeling!"
by SilentLemon January 08, 2009
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Words related to great weather for snorkeling

bad weather ice rain silentlemon snorkeling snow