Other pages in this web site have looked at local (Wisconsin) temperature trends and at the national (USA) temperature trends. That analysis found that the 1930’s were warmer than the decades before or after that decade and after a few decades of cooling (the 1970’s global cooling scare), the two decades at the end of the 20th Century were cooling. Locally, the temperatures over the past few years of this decade have been decreasing.

The trends at sites around the world have also been analyzed. Using the ‘raw’ NASA GISS temperature data (not the ‘combined’ or ‘homogenized’ alternate selections among the three GISS options), an attempt was made to find several locations in each region having a complete (or very nearly complete) temperature record from the present to before 1900. This was not always successful, with many records ending around 1990. Other sites did not have a long enough record or with too many extended gaps in the record. The locations were collected into 15 regions for this world analysis. Most of the temperature data records were collected from the GISS site on January 9, 2010 when data entry for the 2009 year was not completed; however in April 2010 when 2009 data was available this analysis was updated to include that last year.

The main reason for this analysis was to check for the same trends noted in America but on a world wide scale: a warming in the early 20th century (in the 1930’s) while CO2 levels were rather static (suggesting that CO2 is not related to historic rising or falling temperature trends), followed by a cooling period (in the 1960’s) when the CO2 levels were increasing (a contradiction of AGW, a proposed relationship between rising CO2 levels and rising temperatures), followed by a recent warming period (in the 1990’s) when both the CO2 levels were increasing and the sun was in a particularly active phase.

This page presents a summary of that analysis. Here is a text file that lists the locations in all the regions used in this page and a few samples of the temperatures. Here is a Word document with the links to the GISS data for all the locations, as well as the latitude and longitude (from GISS) for each location.

A chart showing the annual average temperature trend for each location in that region will be shown below, followed by the 10-year average temperatures. This average smoothes the many year to year variations at most locations. All of the charts are screen captures from the Excel files which can be obtained from the author.





Warming, cooling and warming trends can be seen while CO2 levels would have been steadily increasing.






This region has rather flat averages. Unfortunately, the GISS data records stop around 1990 for all but one location.








Definite warming, cooling and warming trends can be seen while CO2 levels would have been steadily increasing. Unfortunately, most of the GISS data records stop for Canadian locations around 1990.






Several location noted cooling in the 1940’s and warming in the 1950’s. For most locations, the 10-year average temperature in 1990 was not much different than 1900.






Several locations show warming, cooling (with the low point in the 1970’s, which is while CO2 levels were increasing), and warming trends.






Definite warming and cooling trends can be seen while CO2 levels would have been slightly increasing. Two of the three records in GISS end before 2000.






This region shows a similar strong warming in the 1930’s as in the USA followed by a cooling trend. In most locations in this region, that cooling trend continued into the 1980s.






Several locations noted warming in the 1950’s.






The sites in the North show similar warming and cooling trends while the site near Antarctica does not.






Some locations show warming or cooling trends while most are fairly flat. Many of these records in GISS end around 1990.






Only two locations among the set of 8 show pronounced longer duration trends (cooling to a low point the 1920’s or warming to a high point in the 1940’s). Most of their records in GISS end around 1990.






Several locations show cooling and then warming in the middle of the century.






The locations in India show fairly flat trends while those in the Middle East noted definite periods of warming and cooling.






Most locations in this region show a cooling trend in the 1960’s and 1970’s.






Most locations in this region show warming in the 1930’s.

For comparison, here is the temperature trend in the USA along with the CO2 levels in that time span (the same time span as in all the above charts).



I suggest that there are no regions where the temperature trends conform to the trend in CO2 levels. There must be other significant climate factors that cause temperatures to warm and cool over spans of many years. It must be difficult to justify the claim that warming at the end of the 20th century is caused solely by increasing CO2 levels even though many regions also had warming earlier in the 20th century when CO2 levels were relatively static and that initial warming was often followed by a cooling trend even as CO2 levels started to increase at a higher rate than before (in the 1960’s). Each of the regional Excel files includes a chart that compares the average temperature at one location with the solar sun spot cycle length.

The various Excel spreadsheets for this web page can be obtained from the author at dave@cultureandreligion.com.



Here is the American temperature trends presentation.

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created - Feb. 2010
last change - 04/11/2010