In cold climates, snow on PV modules presents a significant loss of efficiency due to reduced transmission and shading effects. Panels will often experience partial snow coverage, for instance during the spring, when insolation is relatively high while the weather is still cold. In this work the simulation tool LTSpice is used to predict and quantify the effects of partial shading profiles on PV modules. The simulations are compared to production data under conditions with partial shading due to snow at Campus Evenstad, Norway. Simulated values are in good accordance with production data, showing that the model realistically describes shading due to snow. It is clear that even very moderate snow coverage has a large effect on the electricity production, as the reduction of transmission of a single module will affect the whole string of modules. It is also shown that horizontal orientation of the panels may give better performance under partial snow coverage than vertical orientation. This is due to the configuration of cells and bypass diodes within the module. The largest uncertainty in the LTSpice model today is the transmission of the snow cover. This issue will be addressed with the installation of new equipment for field transmission and spectrally resolved irradiance measurements at IFE.