For most of my flying career, I had thought that winds reported for a specific airport or terminal area were reported as magnetic directions, where winds aloft were always reported as true directions.
“If written it’s true. If spoken it’s magnetic.”
METARs, TAFs, and winds aloft are in reference to true north. ATIS, PIREPs, and automated weather reports are in reference to magnetic north.
Something I remember from a college aviation weather course! 😁