OK, I've taken data from BOM, Gold Coast Seaway.
Used the 'Other Formats', 'Other Times & Places' links:
www.bom.gov.au/climate/dwo/200704/html/IDCJDW4050.200704.shtml

I used the wind speed as of 3pm and collaborated into these pretty graphs. No real surprises except the average Westerly at 18 knots. I was looking for a hole around the 5.7m sail range, didn't find:







I've got the raw data here if anyone wants to re-use it
(Some formulas didn't upload by looks of it and are missing)
http://spreadsheets.google.com/pub?key=pbEsK7S2bJ8WVMEN9Cr8qKg

> Laurie, suggestion: Possible to have map with current wind speed for locations, so we can track changes as they come through?