California mean surface temperature trend shows no evidence of global warming

One of the strongest and most obvious arguments against the belief that increases in atmospheric CO2 is resulting in catestrophic global warming is the lack of any evidence of such an effect on surface temperatures at the national, state or local level. An examination of mean monthly surface temperature data for the State of California from 1834 to 2011 is presented below. The trend line is hardly alarming, given the variability in the recorded temperatures from month to month and year to year.

Cal scatter plot

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