Implementation and validation of Climak 3 weather generator

Weather generators (WG) are stochastic models, which generates series of weather data of indefinite length with statistical properties similar to those of the original series. WG have been extensively used in different biophysical models, providing them with meteorological input data. Climak 3 is a new version of Climak (Danuso, 2002), capable to generate daily meteorological data of precipitation, minimum and maximum air temperatures, solar radiation, reference evapotranspiration and wind speed. The performance of Climak 3 was tested using meteorological datasets coming from different locations over the world. The results for Italy, Bulgaria and Argentina are presented and discussed