Met Office Hadley Centre observations datasets
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CRUTEM4 time series

Calculating error bars on a time series average of CRUTEM4 is not a trivial process. Each component of the uncertainty on the gridded values has a different correlation in space and/or time, and these correlations have to be allowed for when computing uncertainties in regional or temporal averages of the gridded data.

To try and make these different effects clear we present these uncertainty components separately in the plots and data files for each time-series. The data files contain 12 columns:

More details are given in Brohan et al (2006).

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