I have ridden El Tour a few times and on a tandem with DH. There are no major steep climbs IMO, but some longer gradual climbs with some hills. I know everyones definition of a "climb" would vary, but I hope that helps a bit . Most of the time it is pretty chilly in the morning, but warms up quickly. My dress has been booties, gloves, thermal undershirt, arm warmers, headband for ears and vest. Good luck to all!