system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why does going out in the cold make my nose runny?

Thanks all for the answers!  I believe this topic has been very well explained and I appreciate all of the information that has been provided!  You're all the best :)
gpt
The air in your lungs is warm and moist. When you exhale through your nose, this moist, warm air immediately hits cold air.

Cold air has a lower capacity for moisture, so introducing warm, moist air into it causes the moisture to condensate out of it - essentially, the air coming from your lungs is all, "Nope, don't feel like carrying this water anymore" and drops it all right at the opening of your nose.