Relative Humidity is a purely ground-based (MET-office) recording, and not recorded on the aircraft.
Even if your research turns up that the RH was 100%, that doesn't imply a wet runway, simply that it is about to, or is raining.
If you can establish that it was raining from RH, it may be only a light "sprinkle", leading to, at the most, a slightly damp (non-wet) runway. Of course the opposite extreme of a well flooded runway also applies.
Regrettably, I believe that chasing RH records will not lead you to the results that you seek, sorry to rain on your parade
Regards,
Old Smokey