To the best of our knowledge, the influence of vibrational distortions on Mössbauer parameters has not yet been evaluated in a quantum chemical study. Our approach is to generate an ensemble representative for a given temperature using Wigner sampling. This allows us to study the temperature-dependence of the quadrupole splitting explicitly for the first time. Moreover, our analysis provides explanations for the experimental observations that are rooted in an electronic structure and normal mode analysis of the ensemble.