So here's a thought. Rather than be bummed when its overcast because the day lilies will not open when its cloudy, maybe we should all own nightbloomers which bloom in the evening. Afterall they bloom at a time when there is not as much sunshine right? Correct me if I'm wrong, as I only recently acquired a couple nightbloomers and they have not bloomed just yet, so I do not know how they behave in various amounts of sunlight.