What is the standard temperature at sea level?

The standard temperature at sea level is 59 degrees Fahrenheit. This value is part of the International Standard Atmosphere (ISA), which provides a model for temperature and pressure at varying altitudes. At sea level, the ISA defines the average temperature as 15 degrees Celsius, which converts to 59 degrees Fahrenheit. This standardization is crucial for aviation as it allows for consistent calculations of aircraft performance, including lift, engine performance, and fuel efficiency. Understanding this standard temperature helps pilots and engineers accurately assess conditions for flight operations, ensuring safety and efficiency.