optimal playing condition

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bobbyDK

today it is 30 degrees celcius (86 fahrenheit) in denmark.

that makes me wonder if playing chess should be avoided if it is too hot - cause I think it must lead to more blunders.

I think I have read somewhere that the brain cannot operate 100% if it is warmer than 25 celcius (77F) - but I cannot find the source. 

Bent Larsen lost games to Bobby Fischer because it was too warm. So it obviously affects grandmasters as well.

NewArdweaden

No, I play worse in the winter, because I have to shovel snow all the time and I'm tired as kcuf.