Cold weather. Presumably because of the rise of homelessnes.

Edit: read the article. It plays a contributing part but the first paragraph below was ineresting.

Winters in much of America are now, on average, 4 degrees warmer than they were a half-century ago, according to Climate Central, an independent research group. But climate change has also led to more bursts of extremely cold winter weather, including polar vortexes, which occur when Arctic air blows into the United States.

This “winter whiplash,” as Victor Gensini, a professor of meteorology at Northern Illinois University, describes it, can make people more vulnerable to cold snaps.

“We are less accustomed to experiencing those cold temperatures,” he said, “so that when they do occur, it is much more of a shock to the system.”

The authors said other factors could also be at play, including social isolation, substance abuse and an increase in homelessness. Dr. Neha Raukar, an emergency room doctor at Mayo Clinic in Rochester, Minn., said that in recent years she had seen more patients with cold-related injuries who were intoxicated. People who are drinking alcohol may not realize how cold it is outside, she added.

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