In article
<9a0f9b25-4c43-4934-8d68-b144207ae237@e32g2000prn.googlegroups.com>,

When you are cold, your body restricts your blood flow from
your arms & legs in order to retain the body heat in the core
of your body.  You have to warm up your core body before your
brain turns the blood back on to your arms, legs, hands, and
feet.  Add on to this that you have far more nerve endings
in your hands than in most other parts of your body.

-john-