This article talks about the evaluation of cloudiness/haziness factor for composite climate of Toronto (Ontario, Canada) by considering the hourly data of total (global) and diffuse radiation obtained from Canadian Weather Energy and Engineering Datasets (CWEEDS) [1] for the years 2008–2017. For a case study, the summer month of August is considered for clear sky (blue sky) condition. The simple regression analysis as proposed by Singh and Tiwari [2] is adopted to determine cloudiness/haziness factor for hourly average solar radiation. The cloudiness/haziness factor is evaluated for some typical days of August for ten-hour duration and compared with the one obtained by the average total (global) and diffuse solar radiation. It is observed that there is a fair agreement between the results obtained by using the parameters for cloudiness/haziness factor of Singh and Tiwari [2] and the hourly data of global and diffuse radiation from CWEEDS with correlation coefficient of 0.97 and 0.82 and standard error deviation of 14.23 and 4.24% for global and diffuse radiation respectively.