Trends for the future

Precipitation

From a global warming simulation done by the National Center for Atmospheric Research (NCAR) GCM
The image shows the annual (January through December) precipitation (mm/day) mean simulated for the periods 1961-1990, 2000-2029, 2030-2059 and 2060-2089

Source, and for more simulations, see the website of the Polar Research Group at the University of Illinois