HadCRUT4 Diagnostics

Time Series

Global (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.

The red bars show the global annual average near surface temperature anomalies from 1850 on. The error bars show the 95% confidence intervals on the annual averages. 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% confidence intervals on the smoothed curve.

The data for the global time series is available from the data page

Northern hemisphere

The red bars show the northern hemisphere annual average near surface temperature anomalies from 1850 on. The error bars show the 95% confidence intervals on the annual averages. 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% confidence intervals on the smoothed curve.

The data for the northern hemisphere time series is available from the data page

Southern hemisphere

The red bars show the southern hemisphere annual average near surface temperature anomalies from 1850 on. The error bars show the 95% confidence intervals on the annual averages. 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% confidence intervals on the smoothed curve.

The data for the southern hemisphere time series is available from the data page

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