Indiana is too cold to grow palm trees.  Indiana has a humid continental climate, with cool winters and warm summers. The average temperatures in January range from 17°F (–8°C) to 35°F (2°C). Average temperatures in July range from 63°F (17°C) to 88°F (31°C). Indiana USDA hardiness zones range from 5a to 6b. The warmest temperature […]