> Home > HadCRUT3 > Diagnostics >

HadCRUT3 Diagnostics: global average (NH+SH)/2

Calculating the global mean as the mean of the northern and southern hemisphere averages helps prevent the value becoming dominated by the Northern hemisphere, where there are more observations.

Annual series

The red bars show the global annual average near surface temperature anomalies from 1850 on. The error bars show the 95% uncertainty range on the annual averages. The green bar shows the provisional average for the year so far. The thick blue line shows the annual values after smoothing with a 21 point binomial filter. The dashed portion of the smoothed line indicates where it is influenced by the treatment of the end points. The thin blue lines show the 95% uncertainty on the smoothed curve.

Annual series smoothed with a 21-point binomial filter

Data file (in this format).

Annual series

Data file (in this format).

Monthly series

Data file (in this format).

Commercial and media enquiries

You can access the Met Office Customer Centre, any time of the day or night by phone, fax or e-mail. Trained staff will help you find the information or products that are right for you.
Contact the Met Office Customer Centre