Question 30
Domain 2: FAA Part 107 WeatherIn a METAR, what does the code "M04" indicate for temperature?
Correct answer: A
Explanation
In METAR coding, the letter "M" before a temperature means "minus." So "M04" indicates a temperature of minus 4 degrees Celsius, with the leading zero showing a single-digit value.
Why each option is right or wrong
A. Minus 4 degrees Celsius
Under ICAO METAR coding conventions, temperatures are reported in whole degrees Celsius, and a preceding "M" denotes a negative value. The group "M04" therefore decodes to -4°C, with the leading zero used to format the single-digit magnitude as two digits.
B. Maximum temperature 4°C
C. Temperature 4°C at midnight
D. Minimum temperature -4°C