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.
<> <> <> Land Data Only <> <> <>
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)
Comparison of the surface temperature integrated over the land using 1200 km smoothing. (12-month running means used).
Comparison of v3 and v4 for the month with largest difference in recent years.
<> <> <> Standard Land and Ocean Data Analysis <> <> <>
Our standard global mean temperature using ERSSTv5 for the sea surface temperature.
The annual mean temperature with Lowess smoothing.
The global distribution of surface temperature changes since 1900 and 1960 (many Antarctica station data start in the late 1950s)
Last 5-year and 11-year temperature distributions relative to 1951-1980 mean.