However, I recall reading recently — but was unable to find the reference, unfortunately — that it generally takes about 17
years of global temperature data to reach that 95 % level.
An
analysis of global temperature data by scientists with the U.S. National Aeronautics and Space Administration (NASA) found that 2017 was the second - hottest year on record since 1880 — which...
From Climate Change Dispatch Peter Ferrara — Forbes Blogs — February 24, 2014 If you look at the
record of global temperature data, you will find that the late 20th Century period of global warming actually lasted about 20 years, from the late 1970s to the late 1990s.
The pause — which on some measures has gone on since the mid-1990s — continued into 2014 on the
basis of global temperature data released last week by US space agency NASA and the National Oceanic and Atmospheric Administration (NOAA) of the US.
Climate Central scientists and statisticians made these calculations based on an
average of global temperature data reported by NASA and the National Oceanic and Atmospheric Administration (NOAA).
So the
overseers of the global temperature data sets decided the explosive late 19th to mid-20th century warming and «violent» and «catastrophic» glacier retreat needed to be removed from the scientific record.
And here is an update of the
comparison of global temperature data with the IPCC TAR projections (Rahmstorf et al., Science 2007) with the 2007 values added in (for caption see that paper).
One of the basic problems in reaching rational conclusions with regard to global climate change problems is that AGW proponents and skeptics largely use different data sources and very different
analyses of the global temperature data to support their cases.
The most reliable sets
of global temperature data we have, using satellite microwave sounding units, show no appreciable temperature increases during the critical period 1978 - 1997, just when the surface station data show a pronounced rise.
There are a only three or four sources
of global temperature data, and the one with the longest record is the Met Office of the UK combined with the University of East Anglia.