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2005 Was the Hottest Year on Record
Gulthek writes "As predicted, 2005 was the hottest year since accurate temperature recording began in the late 1800s.
This news is all the more interesting because 2005 was not an "El Niño" year like 1998, the previous record holder."
Give these people some credit for competence. Their analysis takes full account of the locations of the monitoring equipment (see reference 8 of the linked article).
You are incorrect on multiple counts.
The direct data sample is actually smaller. It is less than 30 years. Before that there were no weather satellites and ground stations have never covered the entire globe. 200 years from ground stations are available only for 20-30 locations mostly in Western Europe and Eastern USA..
Indirect data sample - Oxygen isotope distribution, CO2 content, methane content, morphology of some algae and plankton, etc spans back nearly a million years now. All of these can be used to get an estimate for a global or local temperature average. The last 10000 are covered with fairly good precision.
So your 200 years claim is bogus. If you are talking about direct data there is considerably less than that. If you are talking about all data, there is a useable sample going back 10000+ years.
Baker's Law: Misery no longer loves company. Nowadays it insists on it
http://www.sigsegv.cx/
Really, we're having one of hashest winters in the recent X years...
It was -26C here just a few days ago, on the latitude of 50N.
So even though the average temp is increasing, the amplitude is increasing even faster.
The creatures outside looked from Alt-Right to Antifa; but already it was impossible to say which was which.
You asked to see how the data are averaged, and wanted to see it normalized to variance. Here is the site where those records live. Enjoy.
Climate Research Unit Page