The flower hens arrived in Florida in July during the hottest and most humid summer on record and seemed to do fine. They would hunker down in cool shaded sand on hot days and didn't experience any ill effects. Flower hens are from southern Sweden and are more accustomed to warmer temperatures. They would do well in Tennessee.
Hedemora --a breed we also imported-- come from a much colder area of Sweden and are not suited to life in Florida during the summer. They lay eggs during the winter as long as it is at least 5°F and are comfortable in the snow at -5°F. We are shipping our small flock to Montana for the summer.