Positives

• The images can be downloaded in various sizes as image files.
• The website explains what the colors represent in the maps.
  

Additional Prerequisites

• Make sure students are familiar with data representing a departure from "normal" and how that can change, depending on what data range you choose as your baseline.
  

Differentiation 

• One option for using this site would be to allow students to openly investigate. You could use what they find to drive classroom discussion and further learning.
• Another option would be to craft instructions and questions for students to respond to about a specific map or set of maps.