Most snot that a person produces happens when they have a cold or runny nose.
However even when you are not experiencing allergies, runny nose or a cold your body can produce on average of 1.5 liters of snot or mucus each day.
When you're sick with a cold or allergies or just have a runny nose you may produce as much as 2 or 5 liters of snot or mucus each day.
Our bodies produce snot and mucus even when we are not even thinking about it.
You produce more snot during the cold weather because you're usually getting a runny nose due to the cold weather.
During the cold weather I know I produce a lot more snot and have to constantly blow my nose so I always have tissues in my car and in my house and in my pocket available to use to wipe and blow my nose.