After a bit of searching, Roebourne, on the NW coast of WA averages 234.9 clear days a year (vs 43.9 cloudy):
http://www.bom.gov.au/climate/averag...4035_All.shtml
You would definitely be needing a cooled CCD there, though, and would still need to build cyclone proof
I'm also not certain how it fairs with the jet stream, and am making a bit of a dangerous assumption that clear days == clear nights.