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The analysis of the intensity of El Nino and La Nina and its influence on the temporal distribution of rainfall becomes important, since it allows to detect trends or changes in the hydrological cycle of regions to improve the management of stormwater arising from climate events. This study aimed to correlate the variation of the NDC (Number of Days of Rain) in the state of Mato Grosso to the intensity Oceanic Nino Index (a) (ION). We used data from 76 rainfall stations with 30 years of data and 44 stations with data ranging from 20 to 29 years, and throughout this series between the years 1977 to 2006. Monthly data on the intensity of weather phenomena El Nino and La Nina were obtained from the National Service Climatologic U.S. (NOAA - National Weather Service), which were related to monthly data from NDC to describe the pathway of evolution of the same under the influence of ION. In the period 1977 to 2006 the average monthly ION ranged between -1.1 ° C and 1.3 ° C, variations considered moderate, with some variations considered strong in 1982 (2.3 ° C), 1983 (2, 3 ° C). 1988 (-1.9 ° C), 1991 (1.6 ° C), 1992 (1.8 ° C), 1997 (2.5 ° C), 1998 (2.3 ° C) 1999/2000 (-1.6 ° C) and 2002 (1.5 ° C). During the study period there were more positive changes than negative temperature of the waters of the Pacific Ocean, featuring a higher frequency of El Nino. The majority of NDC ends of each month the series, ie those values that were above the NDC below the me an were not associated with the phenomenon ION. Thus, it is concluded that the variations of sea surface temperature (SST) of the Pacific Ocean cause no significant effects evident in the NDC or the State of Mato Grosso.

INFLUÊNCIA DO EL NIÑO E LA NIÑA NO NÚMERO DE DIAS DE PRECIPITAÇÃO PLUVIOMÉTRICA NO ESTADO DO MATO GROSSO