A 20kt crosswind is not difficult.
An excerpt from my 172 flight manual:
The maximum allowable crosswind velocity is dependent upon pilot capability as well as aircraft limitations. With "average" pilot technique direct crosswinds of 37km/h - 20kts can be handled with safety.
There is no demonstrated crosswind at all in the POH. Flying out of a strip that only has one usable runway most of the winter I often encounter days where the crosswind is much higher than 20kts straight across. Currency and practice count in this situation. Landing at night at our place with these winds is a lot more bum clenching!!!