Since the long-lived and uniform-distributed greenhouse gases essentially act in the infrared spectral range, greenhouse gases would result in the increases of both maximum and minimum temperatures (longwave forcing). In contrast, the enhanced backscattering of incoming solar radiation due to the increase in aerosol loading and low cloud amount would result in a decrease of the maximum daytime temperature (shortwave forcing), and the enhanced absorption and backscattering of outgoing terrestrial longwave radiation due to the increase in aerosol loading would result in an increase of minimum nighttime temperature (longwave forcing) although the latter mechanism during the daytime does not shut down. Longwave radiative forcing of both greenhouse gases and aerosols would result in an increase of minimum and maximum temperatures. Here, we analyze the regional patterns of climate change at 52 stations in the Southeast US during the period 1949-94 (46 years). The results show that the arithmetic average of the annual mean maximum temperature at 52 stations decreased by –0.28 C while the minimum temperature increased by 0.09 C during the past 46 years. Obviously, the warming from the longwave forcing due to both greenhouse gases and aerosols was completely counteracted by the shortwave aerosol forcing because the daily temperature is equal to the average of maximum and minimum temperature. The results of a model experiment using Mt. Pinatubo volcanic aerosol over the Southeast support the above conclusion