Ah, at upper 40s to 50s most daylilies would have trouble opening properly (even if they could survive the winter), and the color might not develop properly (at least, that is how they look here at the extremes of the bloom season). Spiders, some unusual forms, and generally CMOs (cold morning openers) would open down to the lower 50s, but I don't know if they could handle a string of such nights. Pity.
So what DO you grow there? Annuals?
