Plain English Meaning
A small snowflake printed next to an airport's name that warns pilots: when it gets cold enough here, you need to add altitude to parts of the approach because cold air makes the altimeter read higher than you actually are.
Full Definition
A snowflake icon printed next to an airport name on instrument approach charts and in the Chart Supplement, indicating that the airport has published cold temperature restricted altitudes. When the reported airport temperature is at or below the published trigger temperature, pilots must apply a cold temperature altitude correction to one or more designated segments of the approach.
Context Anchor
Seen on FAA instrument approach charts in notes related to hot and cold temperature limitations.