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I've been in Italy a week and if you're anything like me you'll have been blowing so hard on the way up you'll be thankful for the cooling effect. I took arm warmers to the top of Stelvio, put them on at the top but took them off almost immediately as they weren't needed. I've not worn any gloves or socks all week either and no base layers.
And if it happens to rain I'd just sack it off and go back down as the descent in the rain ain't going to be much fun anyway.
Is googling 'temperature at mont ventoux' an acceptable way of predicting the weather at the top? I'm nearby, with my bike, but only summer kit. Reading online people say it's proper cold even in Summer, but forecasts seem quite mild using the aforementioned method