6 grade science fair project

If your 6th grader is studying the weather, how about this idea from the Boy Scout merit badge book: Make one of the following instruments: wind vane, anemometer, rain gauge, hygrometer. The library or a good encyclopedia should have directions for making one of these. Keep a daily weather log for 1 week using information from this instrument as well as from other sources such as local radio and television stations or NOAA Weather Radio, and internet sources (with parent's permission). Record the following information at the same time every day: wind direction and speed, temperature, precipitation, and types of clouds. Be sure to make a note of any morning dew or frost. In the log, also list the weather forecasts from radio or television at the same time each day and show how the weather really turned out.