A study published in the journal, JAMA Cardiology, has found that humans are at much greater risk of developing a heart attack in the winter than in the summer.
The study covered over 274,000 people living in Sweden and found that the risk of having a heart attack was greater on days when the mercury fell below zero.
Another journal, PLOS One, found in 2015 that there was a 31 percent increase in the number of heart attacks in the winter than in the summer.
The stroke rates went up with the risk increasing by up to 80 percent if the temperature was below 15 degrees.
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