The upward trend since the late 1800s is clear, and so is the more rapid increase in temperatures since about 1980. The average global temperature anomaly for each year on record is indicated on the graph with light red dots. The solid red line is a five-year running average (the average for a five-year period centered on a given year). Although there is considerable "jumping around" from year to year, the trend is clear: global average surface temperatures are going up.