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The Central Limit Theorem smooths any errors. Decades of observation data make instrument errors very easy to spot. In recent decades daily MODIS (satellite) p

The Central Limit Theorem smooths any errors. Decades of observation data make instrument errors very easy to spot. In recent decades daily MODIS (satellite) polar orbit overpasses provide air column and ground temp data that infills station data (from 1900 onwards). There's a science to ground truthing, error detection, and data correction. Here's the gross single number continent wide average over a century: http://www.bom.gov.au/cgi-bin/climate/change/timeseries.cgi http://www.bom.gov.au/cgi-bin/climate/change/timeseries.cgi It's not hard to find raw data, finer grids, methodology, etc.

bluGill 2y ago
Only sometimes. It is easier to measure in cities, and thus introduce bias based on whatever pavement is populate. There is a lot of data, and the people who measure this (or at least some of them) are aware of the issues and so correct for them. However you cannot just blindly apply the central limit theorem.
- defrost 2y ago
  Who said anything about blindly? Apart from yourself, implying that happens as a matter of course?
- defrost 2y ago
  > It is easier to measure in cities, and thus introduce bias based on whatever pavement is populate. That's a myth. * MODIS sat readings are available under the precessing polar orbit path and are indifferent to urbanisation or not. * National BoM networks have always included stations outside of cities and great care is taken to position stations and to normalise readings. * Urban Heat Island Bias is a myth of long standing; asked and answered three decades ago, two decades ago, a decade ago. Why is it _still_ being raised in 2025? See: https://skepticalscience.com/urban-heat-island-effect-intermediate.htm https://skepticalscience.com/urban-heat-island-effect-interm... https://www.youtube.com/watch?v=pidRKmq2iGI https://www.youtube.com/watch?v=pidRKmq2iGI

bluGill 2y ago

Only sometimes. It is easier to measure in cities, and thus introduce bias based on whatever pavement is populate. There is a lot of data, and the people who measure this (or at least some of them) are aware of the issues and so correct for them. However you cannot just blindly apply the central limit theorem.

defrost 2y ago
Who said anything about blindly? Apart from yourself, implying that happens as a matter of course?
defrost 2y ago
> It is easier to measure in cities, and thus introduce bias based on whatever pavement is populate. That's a myth. * MODIS sat readings are available under the precessing polar orbit path and are indifferent to urbanisation or not. * National BoM networks have always included stations outside of cities and great care is taken to position stations and to normalise readings. * Urban Heat Island Bias is a myth of long standing; asked and answered three decades ago, two decades ago, a decade ago. Why is it _still_ being raised in 2025? See: https://skepticalscience.com/urban-heat-island-effect-intermediate.htm https://skepticalscience.com/urban-heat-island-effect-interm... https://www.youtube.com/watch?v=pidRKmq2iGI https://www.youtube.com/watch?v=pidRKmq2iGI