A report stated June had a record high temperature averaging 1.21 degrees higher than the average for the 20th century in June. There are several things to question. Were the 2010 stations used located the same stations for the 20th Century? Did all the station's period of record cover the entire 20th Century? Were some stations not included?
The report was based on temperatures at stations or data point averaging. This is misleading for several reasons. As cities grew the heat dome effect grew. Station temperatures were not adjusted for the heat dome effect. There are more stations in warmer areas than cold areas. So the average would be biased. Station points over the ocean are done remotely now. Weather satellites didn't exist until 1960 and were not global until the 1990's.
No similar reportissued for the first five months? Were they not done? Or, did they not show a warming trend? In fact the global average temperature for the year could be cooler.
Take 10 containers of blue paint and 10 containers of yellow paint. Mix them together to get green paint. What if the yellow containers were gallons and the blue containers were quarts. The result would be lime rather than plain green.
To average global temperature the station would have to have a coverage area in square miles rather than a data point. Multiply each station temperature by its coverage area. Add the results. Divide by the total area to get average temperature.
To accurately assess global temperature every station must be measuring at the same elevation above sea level and use effective coverage area instead of data point measurements.
The report did indicate cooler than average temperatures in Siberia, Canada, and mid ocean areas. Using a data point average would significantly under represent these areas.
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