Solar radiation at the earth‟s energy source including a significant amount of ultraviolet rays. Ultraviolet B (UV-B) is one of the types of UV radiation with wavelength range from 280315 nm. In this study, the comparison of UV-B at Ras Dashen and Ertale were investigated using satellite data from the National Aeronautics and Space A demonstration (NASA). We accessed 11-year data that ranges from 2010 to 2020 for monthly, seasonal and annual time scale. The result indicates that the UV-B strongly depends on time scale, i.e. it varies from monthly to seasonal, annual time scale for both sites. As a result the highest UVB was observed at Ras Dashen for the month like April and may whereas the lowest was for December, for season the highest spring the lowest winter and for annual for 2019 and 2020, the lowest2010 and2011 respectively. At Ertale the highest UVB was observed for monthly at April whereas the lowest at January, for seasonal the highest was at autumn and the lowest, for seasonal in water and for annual the highest in 2019 and the lowest in 2011. Thus in average UVB distribution at Ras Dashen was stronger than at Ertale. Furthermore in average UVB distribution were increases from 2010 to 2020 in both sites.