 The paper reviews and classifies statistical transformations for post-processing regional climate model, RCM, output into distribution-derived, parametric, and non-parametric methods, and shows that non-parametric transformations have the highest skill in reducing biases in RCM precipitation using a real-world application in Norway. This article was authored by J. E. Haugen, T. Engenskogen, J. B. Brems, and others.