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1 RESUMO O conhecimento das condicoes climaticas e de grande valor para o planejamento agricola adequado. Entretanto, os sistemas de classificacoes climaticas sao pouco utilizadas no âmbito de estudos agricolas, devido a grande abrangencia das escalas em que sao utilizados. Foram utilizadas neste estudo uma serie historica com dados minimos de 20 anos de observacoes em 45 estacoes climatologicas espalhadas por todo Estado de Pernambuco. A funcao de densidade de probabilidade da distribuicao gama incompleta foi utilizada para avaliar a ocorrencia de anos secos, normais e chuvosos. O balanco hidrico climatico mensal foi estimado pelo metodo proposto por Thornthwaite e Mather (1955) e com os resultados obtidos foram realizadas as classificacoes climaticas segundo Thornthwaite (1948) e Thornthwaite e Mather (1955) para cada localidade. Para espacializacao dos resultados utilizou-se o metodo de interpolacao de krigagem. As classificacoes propostas demonstraram-se ser muito sensiveis ao relevo das localidades, aos montantes de chuvas e as temperaturas das regioes resultando em um numero abrangente de tipos climaticos. O sistema de classificacao climatica de Thornthwaite e Mather (1955) permitiu separar eficientemente os climas resumindo as informacoes geradas com maior clareza demonstrando, dessa forma, capacidade para determinacao de zonas agroclimaticas. Palavras-chave: deficit hidrico, evapotranspiracao; irrigacao. SILVA, A. O.; MOURA, G. B. A.; KLAR, A. E. CLIMATIC CLASSIFICATION OF THORNTHWAITE AND ITS AGRO-CLIMATIC  FEASIBILITY IN DIFFERENT PRECIPITATION REGIMES IN PERNAMBUCO 2 ABSTRACT Knowing the annual climatic conditions is of great importance for   appropriate planning in agriculture. However, the systems of climatic classification are not widely used in agricultural studies because of the wide range of scales in which they are used.  A series with data from 20 years of observations   from 45 climatological stations in all over the state of Pernambuco was used.    The probability density function of the incomplete gamma distribution was used to evaluate the occurrence of dry, regular and rainy years.  The monthly climatic water balance was estimated using the Thornthwaite and Mather method (1955), and based on those findings,  the climatic classifications were performed using the Thornthwaite (1948) and Thornthwaite and Mather (1955) for each site.  The method of Kriging interpolation was used for the spatialization of the results. The study classifications were very sensitive to the local reliefs, to the amount of rainfall,   and to  the temperatures of the regions resulting in  a wide  number of climatic types.  The climatic classification system of Thornthwaite and Mather (1955) allowed efficient classification of climates and a clearer  summary of   the information provided. In so   doing, it demonstrated its capability  to determine agro climatic zones. Keywords: water deficit, evapotranspiration, irrigation.

CLASSIFICAÇÃO CLIMÁTICA DE THORNTHWAITE E SUA APLICABILIDADE AGROCLIMATOLÓGICA NOS DIFERENTES REGIMES DE PRECIPITAÇÃO EM PERNAMBUCO