system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does cold weather cause our noses to run?
gpt
The drainage system for your eyes nose mouth and ears all connects in canals and reservoirs in your skull. At lower than normal temperatures (and windy conditions) the pressure of water in the air is lower and because of this any water from your eyes mouth and nose evaporates much more quickly. Your body compensates by releasing more fluid to keep your tissues moist (through tears, snot, saliva). Excess tears and snot meet and drain out your nose, and this is why your nose is runny.