Whether you have a cold or not, it’s a strange phenomenon that often occurs on extremely cold nights.
The medical term for it is called cold-induced rhinorrhea, a natural reaction the body and mind makes to chilly temperatures.
Your body ensures the air you inhale is right for your lung tissue causing the nose to put in more effort then usual. Because cold air is dry, your nose tries to properly humidify it, therefore increasing mucus fluid production. Extra fluid that makes you sniffle and/or have a runny nose!
Another factor that causes the annoyance is due to our breaths inhaling water vapor. Like expelled warm air makes misty breath droplets, the opposite occurs internally.
When your nostrils meet the cold air, moisture merges together and again causes your nose to run.