I think you would only need this for IFR,. So if the rest of the METAR shows that you couldn't use this airfield under VFR, then it wouldn't be relevant. Interesting to know, yes, but not required information for a PPL exam. Probably why it didn't come up in your met theory.
if you care to look more deeply into the subject textbooks are available at CPL level. Good on you for asking.