Abstract
Nara and Kyoto basins belong under Setouchi climate and they are closely bonded to each other. However, the abnormal climate in Nara has been “droughts” while one in Kyoto has been “heavy rains” and “floods”. In this Study, especially taking notice of dry-wet climate between Nara and Kyoto, the author calculated potential evapo-transpiration by Thornthwaite’s method using meteorological data from 1954 to 2012 in Nara and Kyoto. Based on these result, water budget was computed and climatic classifications were analyzed year to year. It was proved by analysis that annual evapo-transpiration in Kyoto exceeds one in Nara and the maximum difference between Kyoto and Nara is 76.8 mm/yr. The annual water surplus in Kyoto is more than one in Nara and the maximum difference between Kyoto and Nara is 446.7 mm/yr. On the contrary, annual water deficit in Nara exceeds one in Kyoto and the maximum difference between Nara and Kyoto is 93.4 mm/yr. As a result of climatic classifications, Kyoto has warmer and wetter climate than Nara and most frequency of climate type in Nara is B2B2′rb3′（23.7%）and one of Kyoto is AB2′rb3′（18.6%）. These are different from average climatic classification.
