Table of Contents
Journal of Climatology
Volume 2014 (2014), Article ID 560985, 10 pages
Research Article

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

1Department of Geography, King Saud University, P.O. BOX 2456, Riyadh 11451, Saudi Arabia
2Department of Geography and Environmental Planning, Towson University, 8000 York Road, Towson, MD 21252, USA

Received 15 August 2014; Accepted 1 October 2014; Published 3 November 2014

Academic Editor: Ines Alvarez

Copyright © 2014 Ali S. Alghamdi and Todd W. Moore. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This study employed the time series of thirteen extreme temperature indices over the period 1985–2010 to analyze and compare temporal trends at two weather stations in Riyadh city, Saudi Arabia. The trend analysis showed warming of the local air for the city. Significant increasing trends were found in annual average maximum and minimum temperatures, maximum of minimum temperature, warm nights, and warm days for an urban and a rural station. Significant decreasing trends were detected in the number of cool nights and cool days at both stations. Comparison of the trends suggests that, in general, the station closer to the city center warmed at a slower rate than the rural station. Significant differences were found in a lot of the extreme temperature indices, suggesting that urbanization and other factors may have had negative effects on the rate of warming at the urban station.