34 Middle East J. Management, Vol. 5, No. 1, 2018 Copyright © 2018 Inderscience Enterprises Ltd. Impact of weather conditions on construction labour productivity in Qatar Ahmed Senouci* Department of Construction Management, University of Houston, Houston, Texas 77204-4020, USA Email: asenouci@uh.edu *Corresponding author Mohammed Al-Abbasi Supreme Education Council, Qatar Building, Corniche Street, Al Dafna Area, Doha, 35111, Qatar Email: abbasi2211@hotmail.com Neil N. Eldin College of Technology, University of Houston, Houston, Texas 77204-4020, USA Email: neldin@uh.edu Abstract: Qatari construction projects frequently encounter significant delays. One of the major causes of these delays is ignoring Qatar’s extreme weather conditions on labour productivity. This paper studies the impact of temperature, humidity, and wind on labour productivity in Qatar for four construction trades, namely, formwork, masonry, plaster, and ceramic tiles. These trades were chosen because they are time-consuming and commonly found in most construction projects. Weather and trade labour productivity data were recorded between July 2013 and February 2014. The results showed that weather conditions have a high impact on trade labour productivity. They also showed that the labour productivity in the summer can be as low as half of that in the winter. Linear regression models were developed to predict trade productivity on a given day of the year. Keywords: extreme weather; weather impact; labour productivity; linear regression; construction delays. Reference to this paper should be made as follows: Senouci, A., Al-Abbasi, M. and Eldin, N.N. (2018) ‘Impact of weather conditions on construction labour productivity in Qatar’, Middle East J. Management, Vol. 5, No. 1, pp.34–49. Biographical notes: Ahmed Senouci earned a PhD in Civil Engineering in December 1991 from the University of Wisconsin-Madison. He has over 25 years of professional experience in the area of civil engineering and obtained over $4.7 million of funded research and published over