Mild January

The nation's warm January was the result of the <a class="taxInlineTagLink" id="PLGEOREG000026" title="Pacific Ocean" href="/topic/intl/pacific-ocean-PLGEOREG000026.topic">Pacific ocean</a>-warming phenomenon known as El Nino
sns-green-warmest-jan-picture

( Liu Jin/AFP/Getty Images )

The nation's warm January was the result of the Pacific ocean-warming phenomenon known as El Nino

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The 20 most-visited national parks in the U.S.
The 20 most-visited national parks in the U.S.