The worst thing about rain is that it can make for a boring day inside. Luckily, there are plenty of ways to keep preschoolers busy on days when the weather is bad. They may not even notice that they never left the house. Here are some rainy day activities you can try with your preschooler today. Make Homemade Playdough You can make your own playdough by combining: 1 cup flour 1 cup water 2 teaspoons cream of tartar 1/2 cup salt 1 tablespoon vegetable oil Mix the ingredients together until they are smooth. Add food coloring if…