Cover the work surface with newspaper. Give the preschoolers washable markers and instruct them to draw a picture of flowers or trees or anything that requires rain to live and grow. Give each student an eyedropper or other squeeze-bulb tool filled with water. Tell the children to squeeze a drop of water onto their picture. Now ask them to squeeze out more drops in several places on the paper. The colors will run and the drawings will look different as a result. Talk about the resulting design and how pretty the raindrops make the picture look.
Type a rain-themed nursery rhyme onto plain paper and make a copy for each preschooler--for example, "Rain, rain, go away. Come again another day." Cut out small magazine pictures of children playing outdoors when it is not raining. Have preschoolers glue some of the magazine cutouts onto the picture. Instruct the students to dip an index finger into blue paint and press their fingerprints onto the picture so they look like raindrops. The children may put a few raindrops as when it sprinkles or a lot of raindrops for heavier rain. Repeat the rhyme with the preschoolers a few times in a sing-song fashion. Hang the finished projects on a bulletin board when they are dry.
Give each child a piece of waxed paper. Have the preschoolers trace a large raindrop shape onto the waxed paper. Help the children use a dull knife to scrape pieces of blue crayon inside the raindrop shape. For the youngest preschoolers, you may choose to make the crayon shavings before class time. Place a piece of waxed paper over the first sheet, covering the crayon shavings. Try to get the crayon shavings inside the traced raindrop shape. Place a piece of plain paper or a cloth towel over the entire project. Press the project with a warm iron to melt the crayon shavings.
When the project cools, let preschoolers use scissors to cut out the raindrop shape. Punch a hole in the point of the raindrop. Tie a piece of string to it. Hang the raindrops in a window or from the ceiling in the room.
Help the preschoolers understand that rain comes from cloud. Ask the children to tear pieces of white tissue paper and glue the wadded pieces onto a cloud shape cut from card stock. Tape five or more pieces of string onto the back of the cloud shape. Then have the kids cover the back side of the cloud with wadded tissue. Give the preschoolers five to 10 raindrop shapes. Have the kids wad pieces of blue tissue paper and glue the wadded papers onto the front and the back of each raindrop. Tape each raindrop onto the loose end of the strings. Hang the mobiles in the room with a loop of string at the top of the cloud.