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Excess attenuation due to rainfall is one of the most important constraints to the performance of microwave radio links. In temperate climates at frequencies above 10 GHz, rainfall rates have significant effects on the performance of microwave radio links. Therefore, the behavior of radio communication links varies seasonally over a year. This paper presents on the results obtained from the analysis of 3 years rainfall rate and attenuation measurements that were carried out in USM. The collected data were used to derive the average worst month statistics and its relationship with the average annual distribution. This relationship was found to be compatible with the one proposed by ITU. Therefore the average 3 years of the worst month data provides further support to the usefulness of the ITU worst month model.