In this study, it was aimed to determine the workable days in agriculture using meteorological parameters, and a databank was formed obtaining the inputs from all weather stations in Central Anatolia Region, which cover a 20-year period, from 1986 to 2006. Running a mathematical model in a computer software specifically designed for this purpose, the data of this databank were exploited to calculate the workable days on a land for soil treatment, crop care and harvest for any given region and to show these data with graphs on monthly or yearly basis. This software may help to use time more economically and reduce the system costs directly or indirectly. Moreover, the data collected are quite necessary to prepare some national or local charts and graphs related to the general distribution of various climate factors.