The American Flag | USAGov

The flag shouldn’t be flown in inclement weather unless it’s an all-weather flag. Flags displayed at night should be properly illuminated. In a time of national mourning, hang the flag at half-mast. The flag can be flown every day, but it is often flown to show patriotism on these observances: New Year’s Day. Inauguration Day

https://www.usa.gov/flag