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This question already has an answer here:

How to manipulate water in way that ice melting point isn't 0°C, but for example 4°C?

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marked as duplicate by Freddy, Lighthart, Jon Custer, Jan, ringo May 13 '16 at 21:07

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One way of doing so would be to significantly increase the pressure. As you can see from this phase diagram, at a pressure of 1 GPa, water ice will remain frozen at temperatures up to about 30°C.

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