This paper is focused on the effect of the severest recorded EI-Nino on Iran climatic situation. The effect of the 1982-83 EI-Nino on temperature
and precipitation is very considerable. The average temperature during the period is much lower than normal and the precipitation is considerably
high. Because the EI-Nino is a periodic and somewhat predictable event, examining the behavior of such parameters during the occurance of the
event will help the prediction of the climatic situation of our country. The investigation shows high negative temperature anomaly and positive
precipitation onomaly during the period. Also an annual lag in minimum temperature and maximum precipitation can be seen clearly, although the
lag in maximum temperature is not so considerable. The contrast of the winter monsoon stream and south or southwestern stream because of the
event produce high gradients of isobars on Iran. The strengthening and shifting of monsoon toward Iran could be seen in the summer monsoon
which results in warmer summers during the period.