Data related to manuscript: RoadSurf: Open-source Road Weather Model library Data contains: -Road weather station observations for Finnish road weather stations from 1 October 2022 to 1 April 2023 -Atmospheric forecast from Finnish Meteorological institute. The data is combination of forecast edited by meteorologist and automatically produced nowcast. -Simulated road surface temperature and amounts of water, snow, ice and black ice on the road -RMSE and bias calucated for the simulations for each month and forecast start time. Also, RMSE and bias for "same as yesterday" and persistence forecasts are included -ReadMe files that explain the data in more detail