Definition
A reference temperature value used in aircraft cold-weather performance and design work, representing the average of the coldest temperatures recorded at a given location over a defined period of years. It is used to establish minimum temperature limits for operations, fuel selection, fluid choices, and structural or system design considerations.
Plain English
It is a temperature figure based on how cold a place typically gets at its coldest, averaged over many years. Engineers and operators use it as a planning number so aircraft and procedures can handle the cold conditions a location is realistically expected to see.
Context Anchor
Seen in aircraft heating, defrosting, environmental system, and cold-weather equipment discussions.
Why Pilots Care
It helps determine fuel freezing margins, engine start procedures, and takeoff performance corrections before operating in regions that routinely reach low temperatures.
Grounding Statement
This term gives a practical cold-weather planning temperature for a location.
Intuition Check
Do not read this as the record low temperature. It means an average cold-condition value used for planning.
Example Sentence 1
The fuel system was designed to operate reliably down to the average coldest temperature expected at northern airfields.
Example Sentence 2
The performance section used the average coldest temperature to adjust takeoff distance for the expected winter conditions.