Circumhorizontal arcs (loosely known as fire rainbows) are the rarest of all naturally occurring atmospheric phenomena.
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Snowiest city in the U.S. : Blue canyon, California.
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The winter of 1932 in the US was so cold that Niagara falls froze completely solid!
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-40 degrees Celsius is equal to -40 degrees Fahrenheit.
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Dirty snow melts faster than clean.
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Temperatures have been cooling since 2002, even as carbon dioxide has continued to rise.
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