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The hourly data of the Galeão Airport meteorological station from the 1951-1960 and 2001-2010 decades were used to compare the variations of the atmospheric characteristics of the city of Rio de Janeiro over a period of 50 years. Suitable statistics were calculated and adequate hypothesis tests used to ensure the statistical significance of the results. The probabilistic distributions were adjusted to the temperature, humidity, atmospheric pressure and wind data and the differences in shape and central trend found in such distributions were highlighted. The comparison of the extreme minimum and maximum daily temperatures between both decades, allowed observing a decrease in the number of successive cold days and an increase in the frequency of successive maximum above the 90% percentile. Some hypotheses were proposed to explain the differences found, the strongest obviously being the increasing urbanization of the city of Rio de Janeiro around the airport, over the last 50 years, followed by the predominance of differences in climate variability patterns in each decade and the atmosphere global warming observed mainly from the 2000s.

CARACTERÍSTICAS ATMOSFÉRICAS DO RIO DE JANEIRO: COMPARAÇÕES ENTRE AS DÉCADAS DE 1950 E 2000