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Calathea is a tropical plant, so any temperature under 55°F or even 60°F for this plant could do it harm. Even at temperatures 10° above freezing, tropical plants can suffer from the 'Chilling Effect' which causes plant cell damage. Neither will the plant tolerate alot of dry, windy conditions. A few days of this and the plant would look ragged and worn. Tropical plants grow naturally in a very warm, humid environment. Calathea's also suffer from sudden fluctuations in temperatures such as a very warm day followed by a sudden cooling trend. If you wish to try growing it outside in the summer, it does best in light shade, not full sun.
The safest spot for this beautiful foliage plant is inside the home.
