Graphing in the Real World

To get the students to analyze data - real data, I thought I would first show them a line graph comparing the July 2012 temperatures with the July 2013 temperatures.  We have had such a cool, rainy summer this year! It would look like this:

Ask the students what observations they can make from this graph.

Then show this graph which shows what is the average temperatures, and have the students make more observations:

What questions and insights might the students make?  Would there be a conversation about what "average" means?