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

Table 2

Results of the trend, urbanization effect, and urbanization effect contribution analyses.

Index	Urban trend ()	Rural trend ()	Urbanization effect ()	Urbanization contribution (, %)
TXa (°C yr^−1)	0.045^b	0.069^c	−0.023	51
TNa (°C yr^−1)	0.068^c	0.083^c	−0.015^a	22
TXx (°C yr^−1)	0.018	0.049^b	−0.030^b	167
TNx (°C yr^−1)	0.096^c	0.101^c	−0.005	5
TXn (°C yr^−1)	0.037	0.053	−0.017	46
TNn (°C yr^−1)	0.005	0.007	−0.002	40
DTR (°C yr^−1)	−0.023	−0.014	−0.009	39
TN10p (d yr^−1)	−0.557^b	−0.627^c	0.070	13
TX10p (d yr^−1)	−0.248^b	−0.414^c	0.166^a	67
TN90p (d yr^−1)	0.327^a	0.468^c	−0.141^b	43
TX90p (d yr^−1)	0.220^a	0.385^c	−0.165^b	75
WSDI (d yr^−1)	0.165	0.278	−0.114	69
CSDI (d yr^−1)	−0.420	−0.161	−0.259	62

Statistically significant at the 90% level.
^bStatistically significant at the 95% level.
^cStatistically significant at the 99% level.