I work Trad and do like to work in the rain.
Nobody at my first job which is 2 holiday cottages so completed that, then the next job a couple of doors up the woman came running out saying "I don't want them cleaned as it is raining, I never want them cleaned in the rain, I don't care if you can't come back this week or not, you can come back next month".
Next village I have 5 in a road, it was steady rain but straight down and not hitting the windows, so I asked each of my customers if they were ok with me cleaning them, they all said yes. The last but one customer who is a perfectionist asked if I had cleaned the other neighbours in the road, I said yes and he said "go ahead", I took extra care and always detail so there is not even 1 drop of water of the glass.
He chatted with me and seemed happy, paid me, while I was there my last customer called him (they are friends) and said she did not want me to clean. I asked if it was because it is raining or because she is out, he said because she is out so I said I can clean them as she only has a small gate. He told me not to.
So I called her in the evening to rearrange and asked why she did not want them cleaned and she said because it was raining.
My friend is a domestic cleaner at the perfectionists house and she told me he told her straight away that I had cleaned the windows in the rain, she said "oh, he normally asks the customer first if they want them cleaned or not" the wife said "to be fair, he did ask". He showed the cleaner some rainbow marks on the conservatory door, I still do not know why it left those marks.
So even if a customer says they don't mind if you clean in the rain, they may still not really like or want it.