Make a chart with the humidity across the bottom ( X-Axis) and label it from 0 to 90, in increments of 10, ( 0, 10, 20, 30, 40, 50 , 60 , 70 , 80 , 90)
then use the temperature for the Y axis and label it from 0 to 14 ( 0, 2, 4, 6, 8, 10, 12, 14
them make a dot where the humidity and temperature meet for each line, the first one would be (81, 8.7) and so on.
See attached picture:
