I do it that way. Sometimes people get upset with me because it seems like I have not treated their lawn in months. I do not control the weather. At that point they can get upset with someone else. They do not have to "splain" to the DOA agent why a product with a wind prohibition was being applied during a high wind warning. Or a product with a runoff and groundwater warning applied before a flash flood. Likewise, warm season weeds and grasses do not respond in a positive and predictable manner in cold, cloudy weather. I would feel like such a schmuck and shyster spraying someone's lawn when I knew it would not work.