Are we talking about ac crosswind limits or pilot's crosswind limits?
Initial design spec is not based on a pilot's abillty in a crosswind
An experienced P1 on a P3C or Herc can "dip" the wing into a crosswind of 35 knts with skillful use of aileron to effect a good landing
This is taught at OCU level and practised in the Sims
I accept that LCR and co-pilots may be supervised to a lower limit for safety reasons
Contaminated runways is another issue - depends what's on them
9 times the square root of the tyre pressure springs to mind with lots of water. Having to land at 126 knts on a sandy runway when you are on minimums with a piss poor diversion is another matter
There again, depends on ac type