The precipitation in Sweden is expected to increase by 0 – 40 % over the next century. Variations in precipitation between different years and different decades are greater than for temperature. The greatest precipitation increase is during the winter.

During the summer, precipitation for southern Sweden is expected to decrease while changes for the northern part of the country appear to be small (possibly a small increase). This means runoff will increase by 5 – 25 % for Sweden in total, but with large regional differences.

Snow conditions are not only affected by winter precipitation but also by temperature. Consequently the snow season will become shorter and the maximum snow cover less thick, despite increased winter precipitation.

The water supply is expected to increase throughout Sweden with the exception of the south-eastern parts of the country. The annual rhythm in water discharge will change, leading to more unstable winters with greater water flows.