July and August are considered the two toughest months in the gulf region when the heat, coupled with the high humidity, increases discomfort. Over the past few years the maximum temperature crossed 50 degree even though authorities wont officially announce it in public . Even if it shows 52 in our car dash board ,officially it will announce as 42 or 43 !
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http://sports.usatoday.com/2014/06/11/world-cup-2014-heat-brazil/
@samiam Those AC stadiums are yet to be built. Those are in the plans for 2022 World Cup.