Met Office Hadley Centre observations datasets
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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.

Global time series

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

Northern hemisphere time series

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

Southern hemisphere time series

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


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