What does it mean when the METAR of an airport is written with red letters?

It’s to show visibility I believe. Red means incredibly low.


You can go to EDDF now and see why METARs are written in red there.(very low visibility) You can also see a red dot on the airport.
Check this site for how to read METARs: Metar decoding


This is an easy way to figure it out. There are 8 tutorials I believed I’ll give you the first two links to get you started.

Credits to @Mark_Denton

METAR Tutorial Part 1 - YouTube



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The following two are guides for pilot and atc tutorials. The will link you to specific information that may be of use. The tutorials are created by FDS staff members.

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