General gripe...

So, we chose to immigrate specifically to Perth, a decision based largely on the strength of the BOM wind rose shown below, which implies that every 3rd day in summer gets 20-30 knot SW winds in the afternoons. Looked like consistent and paradise-like conditions for windsurfing. However, just as I got some equipment, the winds have been mostly offshore easterlies, with forecast for more of the same. Is this normal for here?