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The maximum temp over here is still not higher than the overnight minimum where I grew up.
There is less aircon in homes here (then again I never had aircon at home or in my car in Oz) but there's also people being dumb not knowing how to cool down, watering their lawns at 2pm, leaving all their curtains open for full sun to come in, not opening windows to allow breeze in, going for a run at midday and not drinking anything like some kind of 1920s water-is-evil knob.
Heat or helmets?
I just spent weeks riding through 40C+ with long hair and an low-vent aero helmet and didn't die. #championsarentborntheyrecooked