The average wind speed in Ireland according to the Irish metereolegical office is 7 – 18 mph. “Average annual wind speeds range from 7 m.p.h. in parts of south Leinster to over 18 m.p.h. in the extreme north.”
This converts to 3.12 – 8.04 m/s, I have seen claims by a wind turbine provider that the average wind speed in Ireland is 9.3 m/s – 14.16 m/s. This does not correlate with the met office and should be ignored.