This work attempts to know a temporal window, throughout a typical day in the city, which is representative of daily urban noise parameters (such as the Lday), within a known and acceptable deviation. To do this, a continuous on field sampling of the urban noise throughout 12 daytime hours and without interruption are carried out. Then is stored the data in a digital form. This procedure is repeated in several locations in the city of La Plata, picking them so that, between them, have different characteristics of urban activity. That can cover, in some way, the different conditions of noise that can be found in the city. Later a laboratory processing is performed, analyzing the behavior of different acoustic parameters for various intervals of measurement and with different durations of time, and performed at different times of the day. Also, the results are compared with those obtained in previous years at the same locations.