For me the very heavy winds + rain are the worst of all conditions for window cleaning.
Not because of the risk angle, I mean because the windows are dirty within a day of you cleaning them.
The gale force winds pick up no end of debris from fields, trees, road and peoples gardens, the rain lashes the walls and windows and muck from the walls will run onto the glass, or rather contaminated rain water will.
For me, most of my bread and butter work are weekly or twice weekly cleans on shops, the weather is mostly irrelevent, they are done so often it makes little difference.
But I feel guilty about monthly domestic accounts
If the customer isn't in, and you go back to collect the next day and then glance at your work you can end out cringing inside as you notice that the windows need cleaning once more
Every now and then we have those freak conditions where sands from the Sahara get blown into the upper atmosphere and end out coming down mixed with the rain, everything is dirty then, cars houses the lot
I don't feel guilty collecting after this has happened, I do feel sorry for the customer though, but these are not conditions that can be forecast, you don't know it has happened until everything drys out. Unlike what we are experiencing now.
I use WFP, and I have found that I can work in windy conditions that would stop me in my tracks were I still using my ladders. The higher you go the more difficult it becomes of course, but boy, am I pleased I am no longer climbing ladders
Ian