Met Office Hadley Centre observations datasets
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CRUTEM4 Diagnostics: global average (2NH+SH)/3

Calculating the global mean as the land area weighted average of the northern and southern hemisphere averages helps prevent the value becoming dominated by the Northern hemisphere, where there is typically greater observational coverage.

Annual series

Annual timeseries

Monthly series

Monthly timeseries

Annual series smoothed with a 21-point binomial filter

Smoothed annual series

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