Exposure to heat, he said, can worsen mental health issues.
"Generally what we found was that exposure to hotter temperatures and more precipitation increased the reporting of mental health problems".
The participants were asked to report their mental health status, stress, anxiety, depression and mood changes over 30 days.
Published in the journal Nature Climate Change, one study led by Stanford University economist Marshall Burke found that a 1.8-degree Fahrenheit increase in monthly average temperature causes a 0.7 percent increase in suicide rates in the USA and 2.1 percent increase in Mexico.
Especially significant given the dire United Nations climate change report is the authors' finding that people affected by Hurricane Katrina had a 4 percent higher prevalence of mental-health issues than people in comparably sized communities who had not experienced a natural disaster.
It also recommended investing in mental health resilience-building through parents and teachers; and psycho-social provision in schools and community spaces, especially in hardship contexts such as conflict and natural disaster settings. One signified there had been mental health difficulties over the 30 days.
"While the precise magnitude of these climate-induced adversities is hard to estimate, the theoretical relationship between climate change and mental health risk is compelling", the study author notes.
Other studies have found a connection between suicide rates and temperature.
The data also reveals that the risk of mental health related issues is more likely to affect people with low incomes and women as compared to men.
Finally, the team considered the toll of hurricanes on mental health.
Researchers say they noticed an increase of "problems with emotions" during 30-day periods that had temperatures averaging over 86 degrees Fahrenheit.
Finally, the team examined mental health reports from people affected by Hurricane Katrina and compared them to reports from people in comparable-sized places that had not been affected by the catastrophic hurricane.
For this study, researchers examined the mental health records of 2 million randomly selected USA citizens using data collected by the Centers for Disease Control and Prevention's Behavioral Risk Factor Surveillance System between 2002 and 2012, comparing the responses to meteorological and climatic data from the same period.
He said millions of people are caught up in conflict and disasters, putting them at risk of a range of long-term mental health problems. "In that world, the effect between hot temperatures and mental-health outcomes might be reduced". He warned that a 2 degree Celsius rise can push human mental health over the edge.
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