In this paper, the temperature and annual precipitation data has been applied in 44 years for the synoptical stations northwest zone of Iran. Among the stations, eight of them, which have the perfect data and coverage, has been considered to analysis applied. In this study Transfer function models have been used to analysis time series. In this method, firstly, the stations have been modeled then the data has been analyzed and predicted on them. Finally, from the process exam the considered stations have been examined, and the significant of fluctuations process of temperature and precipitation have been characterized. The results show that Mianeh, Tabriz and Maku stations have significant process. In process of annual precipitation, according to the results of exams, Tabriz, Ardabil, Urmieh and Khoy stations have significant process and in all of them annual precipitation has falling process.