Normal year of Global radiation and temperature

Last update: Jul. 2017


The resource serves hourly, daily or monthly values of global allsky radiation (horizontal or inclined) for the whole world. Monthly values are taken from climatological databases (ESRA, METEONORM). Hourly radiation and temperature are generated stochastically; diffuse and beam radiation are modelled as well as radiation on inclined surfaces. The values correspond to a normal (typical) year. Radiation for inclined surfaces are calculated, if the inclination devides from zero.

General input variables.


The resource accesses the databases of SODA Linke turbidity for airmass 2 and uses a slightly changed ESRA clear sky model for clear sky radiation (Rigollier, 2000).

All hourly values are calculated according the SODA chain of algorithms (Algorithms for the computation of advanced parameters. Report to the European Commission, January 2002).
First daily and hourly values of global radiation are calculated, then the radiation on inclined plane is calculated for hourly values and summed to daily values. Daily and hourly global radiation is generated according Aguiar and Collares-Pereira (1988, 1992), for radiation separation and radiation on inclined surfaces Perez models are used (1986, 1987, 1990 and 1991). Temperature is generated according the temperature distribution of the nearest measurement station (network of more than 4000 sites all over the world) and hourly global radiation.

Aguiar, R., M., Collares-Pereira and J.P. Conde (1988): A simple procedure for generating sequences of daily radiation values using a library of markov transition matrices. Solar Energy, Vol. 40, No.3, pp. 269-279.

Aguiar, R. and M. Collares-Pereira (1992): TAG: A time-dependent auto-regressive, Gaussian model. Solar Energy, Vol. 49, No.3, pp. 167-174.

Perez, R., R. Stewart, C. Arbogast, R. Seals and J. Scott (1986): An anisotropic hourly diffuse radiation model for sloping surfaces: Description, performance validation, site dependency evaluation. Solar Energy, 36, 6, 481-497.

Perez, R., R. Seals, P. Ineichen, R. Stewart and D. Menicucci (1987): A new simplified version of the Perez Diffuse Irradiance Model for tilted surfaces. Solar Energy, Vol. 39,No.3,pp. 221-231.

Perez, R., P. Ineichen, R. Seals, J. Michalsky and R. Stewart (1990): Modeling daylight availability and irradiance components from direct and global irradiance. Solar Energy, Vol. 44, No.5, pp. 271-289.

Perez, R., P. Ineichen, E. Maxwell, R. Seals and A. Zelenka (1991): Dynamic Models for hourly global-to-direct irradiance conversion. Edited in: Solar World Congress 1991. Volume 1, Part II. Proceedings of the Biennial Congress of the International Solar Energy Society, Denver, Colorado, USA, 19-23 August 1991.

Rigollier C., Bauer O., Wald L., 2000. On the clear sky model of the 4th European Solar Radiation Atlas with respect to the Heliosat method. Solar Energy, 68(1), 33-48.

(Link with these infos)