Which temperature corresponds to Standard Day - Sea Level in Fahrenheit?

The standard atmospheric conditions at sea level, known as the Standard Day, are defined by specific temperature and pressure values. According to the International Standard Atmosphere (ISA), the temperature at sea level is set at 15 degrees Celsius. When converting this temperature to Fahrenheit, it corresponds to 59 degrees Fahrenheit.

This value is fundamental in aviation because it serves as a baseline for various performance calculations and calibrations. Understanding the standard day temperature is crucial for flight engineers who need to ensure that aircraft performance is assessed against these established conditions for accurate operational evaluations.

The other temperature options do not align with the ISA standard for sea level, making them incorrect in this context.