| Summary: | With rising average temperatures and extreme heat events becoming more frequent, understanding the ramifications for cognitive performance is essential. I estimate the effect of outside air temperature on performance in mental arithmetic training games. Using data from 31,000 individuals and 1.15 million games played, I analyze frequent engagement in a cognitively challenging task in a non-stressful and familiar environment. I find that, above a threshold of 16.5∘ C, a 1∘ C increase in outside air temperature leads to a performance reduction of 0.13%. The effect is mostly driven by individuals living in relatively cold areas, who are less adapted to hot temperatures.
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