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We will present a micromagnetic modeling study of spin transfer switching in magnetic tunneling junctions (MTJs) and its dependence on thermal effects due to the finite temperature of the MTJ. It will be shown that the major effect of temperature is the introduction of a non-zero distribution of local magnetization deviated from the easy axis of the free layer. In addition to that, we will present a discussion on source of asymmetry between antiparallel (AP) to parallel (P) and P to AP switching dependence on temperature observed but not explained earlier in the literature.