GHCN V4 vs. V3

NOAA released version 4 of the Global Historical Climatology Network - monthly (GHCNm) dataset in late 2018. GISS is switching to v4 from v3 in March. Here we make a comparison of versions 3 and 4.

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In order to see more locally 250 km smoothing is used and no interpolations are made in the maps. The numbers on the top right are the area-weighted means over the grid boxes with data. (2019/02/22)

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Comparison of the surface temperature integrated over the land using 1200 km smoothing. (12-month running means used).

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Comparison of v3 and v4 for the month with largest difference in recent years.

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Our standard global mean temperature using ERSSTv5 for the sea surface temperature.

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The annual mean temperature with Lowess smoothing.

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The global distribution of surface temperature changes since 1900 and 1960 (many Antarctica station data start in the late 1950s)

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Last 5-year and 11-year temperature distributions relative to 1951-1980 mean. (2019/02/23)