The trend line after 123 years of data shows average temperature in Grand Rapids, Michigan, rising 0.7 degrees F, or 0.388 degrees C, 65% less than the 1.1 degrees C claimed for the world by the United Nations Intergovernmental Panel on Climate Change yesterday.
And the minimal warming in Grand Rapids may in fact be misleading. Five of the data points in those top eight are from the last twenty-five years, during which increasing development around the KGRR measuring station may well be contributing heat island effects.
