عنوان مقاله [English]
The statistical sample used in this research was the seasonal and annual temperature in Iran during the period of 35 years (1960-1995). In this regard, among 110 synoptic and climatologic stations, synoptic stations of Isfahan, Ahwaz, Bandar Anzali, Bandar Abbas, Tabriz, Khorramabad, Zahedan, Mashhad and Yazd, whose temperature data are complete during 35 years and need not to be reconstructed have been selected. The annual temperature series of selected Iranian stations were evaluated in terms of analysis of periodic variations by factor and non-factor tests. Based on series examinations, temperature series of Ahwaz, Bandar Abbas, Khorramabad and Mashhad follow the patterns of periodic changes, and the rest of the stations were without periodic variations. The series with periodic variations were analyzed and predicted by percentage change method.
Considering the analysis and prediction of periodic changes in temperature of the stations, the northeastern, southern and southwestern parts of Iran have periodic changes, and the central, northern and northwest of Iran do not follow the periodic variation patterns.