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The present work had for objective to determine the minimum number of years adapted to identify the climatic type and the flotations among its limits for the method of classification of Kõppen (1918) and of Thornthwaite (1948), to evaluate the probabilities of the components of the swinging hídrico of Thornthwaite and Mather (1955) in the monthly scale and decendial and to compare the swingings normal, medium and medium hidricos seeking to offer more complete information for a climatic analysis and planning of the activities of the agriculture. For so much, 80 years of monthly data and decendiais of temperature of the air and pluvial'precipitation of Piracicaba-SP were used. The used method went to climatic classification of Kõppen (1918) and of Thornthwaite (1948), the program computacional of the swinging hídrico (8arbieri et aI., 1991) and frequencies and probabilities of the components of the swinging hídrico. Starting frem the results of the frequencies and probabilities of the climatic classification of Kõppen, for the mobile averages in the orders of 10, 15, 20, 25, 30 and 35 years he/she identified that the climatic type was Cfa (rainy tropical climate, with the precipitation of the smaller most humid month than 10 times of the driest month) with transition for Cwa (rainy tropical climate, with the precipitation of the month most humid equal or larger than 10 times of the driest month). Para the classification of Thornthwaite the area enquadrou-if in the climatic type B 1 r 8'4 a' (humid type, with the effective Index of humidity (Im) among 20 to 40%) with transition for C2 r 8'4 a' (type subúmido, Im among 20 to 0%), which possess small or any deficiency of water, mesotérmicos, in that 48% of the station of growth of the plants concentrate on the summer. He/she identified that 10 years of observation it would be enough to identify the climate of Piracicaba with 81 r 8'4 a' (Thornthwaite) because it

Variação temporal do balanço hídrico e do clima, de acordo com os critérios de Kköppen (1918) e Thornthwaite (1948), na região de Piracicaba - SP