Ice can form on Earth at temperatures above 32 degrees Fahrenheit (0 degrees Celsius), and water can boil below 212 F (100 C). Here's how.
Water boils at 212 degrees Fahrenheit and freezes at 32 F , right? Sure, except that's not always true. The temperatures at which water boils or freezes can change depending on pressure and other factors.
Naturally, the highest location on Earth — the summit of Mount Everest, at 29,031 feet — is where water boils the coldest, at 154 F , according to the Lunar and Planetary Institute. It's hot water — but it would make a terrible cup of coffee, as water needs to be at least 188 F to make a decent brew. So where does water freeze at the highest temperature? That's a little trickier.
However, ice at sea level can form if the air temperature is above the freezing point, thanks to radiative cooling. For generations, this phenomenon has allowed residents of desert locations to make ice without electricity or freezing temperatures. People living in what is now Iraq and Afghanistan would fill shallow pools with water before a cloudless night and wake up to ice, despite the air temperature being a few degrees above freezing.
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