Daily weather descriptions in diaries are examined to reconstruct the climate in “Little Ice Age”. Characteristics of weather terms, hours and precisions are clarified. Based on the examination, two indices, precipitation ratio in summer and snow ratio inwinter, are set up. Using many diaries, decadal distribution of indices are drawn and climate changefrom 1660's in Japan are reconstructed. The results are as follows. The summerswererelatively cool from 1730's to 1750's, 1780's, from 1830's to 1840's and 1860's. The winterswere relatively cold from 1680's to 1690's, 1730's and 1810's. However, climate change was notparallel between summer and winter.