Analysis and Comparison of Trends in Extreme Temperature Indices in Riyadh City, Kingdom of Saudi Arabia, 1985–2010

Figure 6

Plots of the difference between the urban station and the rural station for six extreme temperature indices. TXa, TXx, and TX90p are representative of diurnal maximum temperature and the diurnal UHI. TNa, TNn, and TN10p are representative of nocturnal minimum temperature and nocturnal UHI. Values greater than zero are characteristic of the UHI effect whereas values less than zero are characteristic of an urban heat sink. Results of the urbanization effect analysis are provided in the top-right corner of each plot.