Draw columns on your poster board. The number of columns will depend on the number of weather phenomenon you want your students to observe. The simplest chart could include four columns for rain, sun, snow and clouds, while more advanced charts could include partly-cloudy, windy and thunderstorms.
Mark each column clearly with a word and picture at the top.
Affix the poster board at child height in your classroom. Depending on the role the chart will play in your daily routine, it could be included in your meeting, science or art area.
Pick a child each day to observe the weather. Be sure you have a system to ensure each child gets a turn.
Ask the child to observe the weather, and give him a small square of white paper and a few crayons. Instruct him to draw a small representation of that day's weather. For young children, this could be a yellow squiggle that indicates the sun; older children may draw blowing wind or lightening bolts.
Help your student choose the right column for his square. Ask the rest of the class to participate in choosing the correct placement. Attach tape to the back of the square, and add it to the appropriate column.
Count the number of squares in each column every week or month. Ask your students simple mathematical questions, like which column has the most and least squares.