This line graph indicates the temperature changes from 1860 to 1999 as compared to 1961 to 1990 normals. The vertical axis represents the temperature change in degrees Celsius and has values ranging from negative 0.6 to positive 0.8. The horizontal axis shows the year from 1860 to 2000. There is quite a bit of small-scale variation but the general trend is a rise of temperatures. The value at 1860 is around negative 0.5 and the value at 2000 is approximately positive 0.3.