Average temperatures in two cities

The line graph compares the average temperature in two cities, Aldar and Bremen, at six points in the year, from January to November.

Overall, Aldar was warmer than Bremen at every point, and both cities were hottest in July. The difference between the two cities was widest in the summer months, and both showed a similar pattern of a steady rise followed by a fall.

In January the average temperature in Aldar was 14 degrees, while Bremen was much colder at only 2 degrees. Temperatures in both cities rose steadily from then on, reaching 18 degrees and 6 degrees in March. By May, Aldar had reached 26 degrees and Bremen 14 degrees.

Both cities peaked in July, at 33 degrees in Aldar and 22 degrees in Bremen, a gap of 11 degrees. After that, temperatures fell in both cities. By November, Aldar had cooled to 19 degrees and Bremen to 7 degrees, so Bremen's fall from its peak of 15 degrees was slightly larger than the fall of 14 degrees in Aldar.

Why it works

• The overview states which city is warmer and when both peak, without using numbers.
• Each figure can be checked on the graph: the gap in July is 33 - 22 = 11, and the falls from July to November are 33 - 19 = 14 and 22 - 7 = 15.
• The writer groups the data by period and compares the cities at each stage.