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ntroduction:The use of photovoltaic solar energy is affected by variations in availabilityof solar radiation. These variations in radiation intensity pose some problemsstability inthe operation of solar panels.Main objective:Such that the need arose to classify a sample of the days of the year 2012 according to values of 𝐾𝑡∗and𝜎𝐾𝑡∗obtained;Material and Methods:a descriptive sequence was taken to classify the days of the year and to analyze the variability of the clear, cloudy and intermediate sky days, and the analytical method was used to determine the clear sky index, a factor that removes and corrects radiation solar due to solar geometry.Experimental/Theoretical Results:The results show that the year 2012, took in a period of 6 (six) months distributed in all Mozambican seasons of the year, presented itself mostly with clear skies days, with an average of 11 intermediate skies days, 21 (twenty and one) clear skiesdays, also featured 18 (eighteen) days of cloudy skiesdays. Discussion:These results agree with thosereported in the literature in Lohmann et. al., 2016, although this analysis in terms of Kernel density magnitude that is notconsidered here its calculation. Conclusion:It can be concluded that this year presented itself mostly with clear skies, with an average of that from the total of 51 days it appears that: 21days show clear sky, that enoughthly classify the condition ofthe year as an mostly clear sky days year.Keyword:Variability, Clear sky index, Intermediate sky, Cloudy sky, Solar radiation, Irradiance