What is the standard sea-level temperature?

• A. 15 C
• B. 20 C
• C. -10 C
• D. 25 C

Answer: (A)

The standard sea-level temperature is 15°C. In the International Standard Atmosphere, the temperature at sea level is defined as 15°C (59°F, 288.15 K). This value serves as a reference for calculations that affect drone performance and aerodynamics, like air density and lift. Real-world sea-level temperatures vary widely with weather, location, and time of day, so 15°C is not a real-time measurement but a fixed baseline used for consistency. The other temperatures are common values people might encounter, but they are not the agreed standard reference.