Does the weather temperature affect how much static electricity in hair?
In a way, yes. Static electricity is best developed in a dry environment. If the air temperature is low there is less water vapour present, if the air is warm there is more water vapour present. Warm air has a higher moisture content than cold air. You can try this at home, get a felt cloth and a perspex rod and try rubbing them at varying temperatures (put them both in the fridge for 10 minutes). You’ll find you get a bigger jolt when they are colder than when they are warm.