What is it about being out in the cold that makes one need to urinate?

Why is it, even though my intake of liquids hasn’t gone up, and I’m perfectly healthy, exposure to extreme cold ( it was 7 degrees here today with a -10 wind chill) causes my bladder to fill almost instantly. Seriously, in normal weather I can go hours without a stop, but once it’s legitimately cold, I gotta go every 20 minutes. And I have noticed this with children playing in the snow…. They’re in and out of the house for the same reason every ten minutes. Is there something in our bodies that is programed for this? Is it how we generate body warmth? Is it just condensation????