Abstract: An analysis was performed on the meteorological data from 10 auto-weather stations located in the urban and suburban areas of Nanning City from 2003 to 2006. It shows that urban heat-island intensity (UHI) in Nanning City had evident variations on daily, monthly and seasonal scales. On average, the UHI was larger for night-time, dry season (September-next January) and autumn than that for day-time, wet season (February-August) and summer, respectively. Using different temperatures as indexes for HUI resulted in slight difference: HUIs for the minimum, maximum and mean temperature over 2003-2006 were 1.43℃, 0.94℃, and 0.28℃, respectively. According to the gray analysis of the meteorological factors for HUI effect, small wind speed and small relative humidity may result in a strong UHI in Nanning City.

Key words: heat-island effect, heat-island intensity, Nanning City