27 knots for takeoff and landing on a dry runway is the max demonstrated and not considered limiting. On a wet runway 27 knots is a limitation, 15 knots on a contaminated. Max tailwind is a limitation of 10 knots at any given time.

Keep in mind each company can have its own limitations, such as at PNCL max operating altitude is FL370, whereas the CRJ is certified to FL410.

A crosswind landing of 35 knots can be done (safely)- seen it first hand- but its not a greaser!