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In this video:
On an average day, a typical person’s nose will produce about one quart of mucus/fluid (just under one liter). Most all of this snot generally gets passed back into your throat and swallowed, often without you even really being too conscious of it. When you’re breathing cold air though, the rate of mucus production goes up significantly, causing some of that snot to come out the front of your nose, rather than back in your throat.
Want the text version?: http://www.todayifoundout.com/index.php/2011/10/why-your-nose-gets-runny-when-it-is-cold/