What are the standard temperature and atmospheric pressure at sea level?

The standard temperature and atmospheric pressure at sea level are defined by the International Standard Atmosphere (ISA). According to ISA, the standard temperature at sea level is 59° Fahrenheit, which is approximately 15° Celsius. Furthermore, the standard atmospheric pressure at sea level is measured as 29.92 inches of mercury (Hg), which equates to 1013.25 hPa or 1013.25 mbar.

This standardization is crucial for various aviation calculations, including altimeter settings, performance metrics, and flight planning. Utilizing these standard conditions allows pilots and meteorologists to communicate and compare atmospheric data reliably.

Other choices do not reflect the established standards. For instance, the temperatures and pressure values in those options diverge from the globally recognized sea level standards, making them unsuitable for precise aviation-related applications.