Take the temperature of various things indoors. For example, the temperature of each room in your house. Temperature near a window, in a fridge, freezer, temperature of different drinks-cold, warm and hot. Record your findings and label clearly. Can you think of a reason why the temperature in each room might be different from each other? Compare the temperature of a room away from the window and near the window. Is it different? Why?
Those who want to make their own thermometer, here is the link to guide you! Have fun!