Please correct me if I am misinformed but I was told, by whom I do not remember, that if possible take hummingbird feeders in at nite when there is cooler/cold weather. The cold nectar that the birds eat in the early morning will cause hypothermia and kill the birds. The feeder will be at least room temperature when hung back out in the morning. Neighbour had a hummingbird bird on his feeder on Thursday.
Good birding and stay safe!!!!!