Oh yes, it can get cold! I have blankets in my car and all my thermal gear, at least at agility no one is paying heed to the handlers appearance, so you can dress in as many layers as needs be! Once you get running it's usually alright and class nights you are constantly moving so you end up stripped down to a t shirt!
I have a similar dream to you Julia, would love my own training facility with aluminium equipment.
I confess agility has taken over my life and sometimes it seems forever between classes, when it is only a week or less! It's the only thing that will get me out of bed on a weekend at silly o'clock.