First, take a look at a movie of the daily mean surface temperature since January 1 2003.
Questions to think about:

Compare this year's temperature to a movie of an average year of daily mean surface temperature. This is the climatology. This climatology covers the period from Jan. 1 1946 until Dec. 31, 2002.

It is difficult to distinguish this year's temperature from an average year's temperature. So we look at the anomaly (the difference between them). This movie is the surface temperature anomaly this year and an average year in the period from 1948 to 2002.

Make your own movie

Year: Domain: Data range: - oC