The model is evaluated by comparing predicted and observed streamflow for a 20-year period (1979-1998) using data from the Torne/Kalix basins in Sweden. The same dataset has been used in the phase 2(e) of the Project for Intercomparison of Land-surface Parameterization Schemes (PILPS). In the Lansjarv catchment, the snowmelt-induced runoff is too rapid and too large in the original CLM. With the freezing point changing from zero degree C to -2 degree C, guided by observations, the ice fraction in the surface soil layers is reduced significantly, the surface is more permeable, and the streamflow is more accurately simulated. This lowering of the freezing point also has a favorable cooling trend in the soil layers, because the original CLM soil temperature has a warm bias under snow conditions. Larger improvements in the simulations occur in Lansjarv than Abiskojokk because the former has shallower snowpack conditions which correspond to greater freezing depth, larger ice fraction, and colder surface soil layers.