Compare Three Sets of Data in Bar Graphs

Here is a bar graph to show the average rainfall for every month of the year in Rome (Italy), London (England) and Wellington (New Zealand):

Example

What is the difference in rainfall between Wellington and Rome in January?

Answer

27 mm

We can see that the blue bar for Rome is 49 mm and the grey bar for Wellington is 76 mm in January.

76 mm - 49 mm = 27 mm

Let's get started and have a go at answering some more comparison questions about this bar chart.