I once lost a customer because I cleaned her windows when there was snow on the ground. It wasn't snowing, in fact if I remember correctly it was bright and clear blue sky.
Cleaned her windows when she was out and left a note. When she returned home she went ballistic. Ridiculous! ridiculous! I'm not paying its ridiculous, in this weather! ridiculous, totally ridiculous etc
I rather got the impression, before my mobile phone melted against my ear, that she didn't think cleaning in the snow was quite the done thing.