personally none of the rules stated I this thread are relevant to me. my mon people are generally mowed on mon, tues on tues and so forth. they are all cut at the same 3" height until drier conditions when I move them up to 3.5". no matter how much or little they grow from week to week. I won't mow in the rain but as soon as I see pavement starting to dry I go out and cut. out of all the wet grass I've cut whether from morning dew or rain fall I haven't harmed a single lawn. as for dry conditions. I mow only if the mower will cut something at the 3.5 height. all those "rules to follow when cutting grass" might be helpful but they aren't words to live by IMO.