Beet juice is full of dietary nitrate. The body converts it into nitric oxide, which naturally widens blood vessels.
When you get cold, your body works to protect its core. Your nervous system and muscle impulses begin to slow down.
Your blood vessels also constrict to conserve heat, which protects your core temperature. Your fingers and toes then begin to get cold.
By adding beet juice to your diet, it improves overall circulation, which then helps increase the temperature to your extremities.
Beet juice has also been shown to lower blood pressure. Better blood flow takes stress off the heart during cold weather.
No matter the temperature, beet juice is simply a good idea for overall health.