Met Office Hadley Centre observations datasets
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HadCRUT3 time series

Calculating error bars on a time series average of HadCRUT3 is not a trivial process. Each component of the uncertainty on the gridded values has a different correlation in space and time, and these correlations have to be allowed for when averaging the errors.

To try and make these different effects clear we show the effects of these three components separately in the plots and data files for each time-series. The station and grid-box sampling uncertainties are shown in red, the coverage uncertainties in green, and the bias uncertainties in blue. The data files contain 12 columns:

More details are given in the paper introducing the dataset.

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