It's been a bit blowy here this week. I had a higher than usual gutter clean to do this week which I had to postpone for very obvious reasons, but was able to carry on doing windows. I have a pair of thick rubber gloves which I use as ladder mitts, and with these on I can jam the ladder under the fascia boards and work away safely enough.
I don't have the ability to measure wind speed, so I use my own judgement to discern if it is viable to continue or not.
John