To understand what a time graph is showing you, you need to look at three things: 1. Title - The title tells you what the graph is about. For example, "Temperature on the First of September." 2.

The hockey stick: The original and later versions. Temperature reconstructions of the past 1000 years See all climate myths in our special feature. Updated: See final section. In fact, later ...

The graph shows spikes and drops in temperature over the past 9,500 years, charting how much higher or lower each year’s temperatures are than the average temperature over the entire time period.