Fig. 1: A line graph titled A hill town in winter: the highest temperature on each of 20 days, in degrees Celsius. Days 1 to 20: 12, 14, 13, 11, 9, 8, 10, 12, 15, 16, 14, 13, 11, 10, 9, 11, 13, 14, 12, 12. Snow fell on days 5, 6 and 15, marked with blue squares.