For the study, researchers combed through a decade’s-worth of data from US Centers for Disease Control and Prevention’s Behavioral Risk Factor Surveillance System, which had 2 million people self-assess their state of mental well-being.
That data were collected from 2002 to 2012.
Researchers say they noticed an increase of “problems with emotions” during 30-day periods that had temperatures averaging over 86 degrees Fahrenheit. Both people with low income and women were 60 percent more likely to have emotions tied to weather than those with a higher income and men, respectively, according to the study’s findings.
More specifically, the study determined that there was a 0.5 increase in mental health difficulties for people in a month that averaged over 86 degrees Fahrenheit when compared to a month with an average between 77 and 86 degrees Fahrenheit.
The study also found that a 1-degree Celsius increase over 5 years — or a 1.8-degree Fahrenheit increase — causes a 2 percent increase in mental health problems.
Other studies have found a connection between suicide rates and temperature.