In India, agriculture is dependent and influenced by Indian summer monsoon rainfall. The variation in rainfall during the pre-monsoon, monsoon, post monsoon and annual period plays the crucial role in crop choice, crop planning and crop productivity. The rainfall data of 68 years has been observed from 1951-2018 for different agroclimatic zones of Punjab, India. The data used to observe the increase or decrease of rainy days during the 7 decades (1951-60 to 2011-18). It has been concluded that the least number of rainy days were recorded at Bathinda during the decade 1951-60 and 1961-70 which later shifted to Sri Muktsar sahib where the least number of rainy days were recorded during the next 5 decades (1971-80, 1981-90, 1991-2000, 2001-10 and 2010-18). Maximum number of rainy days were recorded every year and also during monsoon season at Hoshiarpur during all decades, whereas, maximum number of rainy days during pre monsoon season were recorded at Gurdaspur. During post monsson season, maximum number of rainy days were recorded at Hoshiarpur during first 4 decades which later shifter to Gurdaspur (1191-2000, 2001-10 and 2011-18).Comparing the other decades by taking 1951-60 as a base, results showed that during annual and monsoon season, rainy day events increased up to the decade 1991-2000 and decreased afterwards while during pre monsoon season, rainy day events decreased up to 1971-80 and increased afterwards. Rainy day events decreased with time and least number of rainy days were during 2011-18.