Interestingly enough, it seems that on the days when the ceiling/vis is
low enough to make circling approach difficult are also likely to be
the days when the wind is either very light or lined up with the ILS
straight-in direction.




Nothing wrong with this but more and more airports are getting GPS
approaches for the opposite and crossing directions to the ILS
runways.

So if the wind doesn't work for the ILS runway you can make a
straight
in approach instead the more dangerous circle to land from the ILS
option; lower minimums to boot.