Gauging Rainfall

This Gauging Rainfall activity & project also includes:

How do climatologists determine average rainfall for a locality? Young meteorologists use Voronoi diagrams and weighted averages to determine average rainfall. Simulated maps help them quantify their results.

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Instructional Ideas

  • Involve the entire class in one large group discussion rather than small groups
Classroom Considerations

  • Many of the concepts may be too difficult for students to develop on their own
  • Based on how students draw their Voronoi diagrams, answers will vary widely



  • The lesson makes interesting connections between different areas of mathematics like statistics and geometry
  • Possible solutions are given for each question

  • The leading question refers to a territory in India, but the lesson itself never deals with this territory
  • One of the maps is placed under the wrong question