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This study examines the effect of climatic factor e.g. Temperature (Maximum and Minimum), Relative humidity (Morning and Evening), Evaporation and Rainfall variation on the yield of different stages of wheat in Samastipur district of Bihar by using regression analysis statistical method. The data of wheat yield of 29 Years (1984-2013) was taken from Department of Agricultural Economics, RAU, Pusa and Weather Variables (1984-2013) was taken from Agro-metrology Unit, RAU, Pusa. Regression analysis have used to estimate the relationship of climate variables on the wheat yield. The main effects of all the variables were observed to have statistically non-significant contribution towards changing crop yield except relative humidity (morning). However, the interaction of relative humidity with other weather variables was estimated to have statistically significant contribution towards yield variability.

Key words: Climate change, Wheat yield, Weather variable, Regression analysis.