Our bodies are always naturally producing mucus in our noses which leads to boogers in our noses.
When it's cold outside or you have a cold or flu virus or even allergies then during those things you can get more production of boogers in your nose.
This is normal and nothing to worry about.
If it's allergies then taking some allergy medicine or some nasal spray can help clean the nose and stop the overproduction of boogers.
If it's because of a cold or flu virus then the boogers will stop being produced as much when the virus is over with.
Just make sure to irrigate your nose with some nasal spray or a saline solution.
Keeping your nose clean can help prevent your nose from filling up with too many boogers.