“…In fact, these models presume that maximum temperature will decrease with reduced transmissivity, whilst minimum temperature will increase because of the cloud emissivity. Clear skies will increase maximum temperature due to higher shortwave radiation during sunshine hours, and minimum temperature will decrease due to higher transmissivity at night times; so the difference between daily maximum and minimum air temperatures becomes an indicator of cloudiness (Almorox et al, 2013) Estimating the horizontal global solar radiation using different artificial and computational intelligence techniques including the artificial neural network (ANN) (Tymvios et al 2005;Mubiru and Banda 2008;Şenkal and Kuleli 2009;Solmaz and Ozgoren, 2012), particle swarm optimization (PSO) (Mohandes, 2012), adaptive neuro-fuzzy inference system (ANFIS) (Mellit et al 2007;Rahoma et al, 2011;Sumithira and Kumar, 2012;Güçlü et al, 2014;Mohanty et al, 2015;Mohammadi et al, 2015a), support vector machine (SVM) (Chen et al, 2013;Mohammadi et al, 2015b;Mohammadi et al, 2015c), and etc. has received tremendous attention in recent years.…”