Preschool and Kindergarten Weather Activities, Lessons, and Crafts. "April showers bring May flowers." This saying reminds us that rain helps flowers to grow. It also helps vegetables and other plants to grow. Rain is very important. Without it our rivers and lakes would be empty and we wouldn't have enough water to drink. Use our great weather, rain, clouds, and rainbow activities and printables to help your children learn about the water cycle and the many ways that people use water.