Global Temperatures 1996 – June 2019

Weather Eye
with John Maunder

Global temperatures are compiled for various areas including global (land-ocean), global (meteorological stations), three latitude bands,

and hemispheric, by the Goddard Institute for Space Studies of NASA.

The graph shows the monthly mean global surface temperature anomaly from the base period 1951-1980, for the period 1996- June 2019.

For details see data.giss.nasa. (See graphs at the top right hand corner of the front web page and go to months)

The GISS Surface Temperature Analysis (GISTEMP) is an estimate of global surface temperature change. Graphs and tables are updated around the

middle of every month using current data files from NOAA GHCN v3 (meteorological stations), ERSST v4 (ocean areas), and SCAR (Antarctic stations),

combined as described in our December 2010 publication (Hansen et al. 2010). These updated files incorporate reports for the previous month and

also late reports and corrections for earlier month.

The basic GISS temperature analysis scheme was defined in the late 1970's when a method of estimating global temperature

change was needed for comparison with one-dimensional global climate models. The scheme was based on the finding that the correlation

of temperature change was reasonably strong for stations separated by up to 1200 km, especially at middle and high latitudes. This fact proved

sufficient to obtain useful estimates for global mean temperature changes.

The chart below shows that from 1997 to June 2019 there has been a small warming in the global monthly temperatures, and a relatively

warm period associated with the recent El Nino event.

For further information on a wide range of climate matters see https://sites.google.com/images/climatediceandthebutterfly/

The physicist Leo Szilard once announced to his friend Hans Bethe that he was thinking of keeping a diary: 'I don't intend to publish, I am merely going to record the facts for the information of God.' 'Don't you think God knows the facts?' Bethe asked. 'Yes' said Szilard. "He knows the facts, but he does not know THIS version of the facts' "(From Hans Christian von Baeyer, "Taming the Atom" (from the preface paragraph in "A Short History of Nearly Everything", by Bill Bryson, A Black Swan Book, 2004)



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