The Department of Natural Sciences at the University of Veterinary Medicine Vienna has released an updated version of the World Map of the Köppen-Geiger climate classification. Though the original map was published over 100 years ago, it is still used as both a teaching tool and for research. Scientists note that: "It is also still in regular use by researchers across a range of disciplines as a basis for climatic regionalisation of variables and for assessing the output of global climate models."

From the abstract:

"While the climate classification concept has been widely applied to a broad range of topics in climate and climate change research as well as in physical geography, hydrology, agriculture, biology and educational aspects, a well-documented update of the world climate classification map is still missing. Based on recent data sets from the Climatic Research Unit (CRU) of the University of East Anglia and the Global Precipitation Climatology Centre (GPCC) at the German Weather Service, we present here a new digital Köppen-Geiger world map on climate classification for the second half of the 20th century."

You can download the map in a variety of formats that include gif and pdf. A ZIP file that contains: "one text file (ASCII text with CRLF line terminators) including the climate classification on a regular 0.5 degree lat/lon grid for the period 1951 to 2000. The text file contains one line of header followed by 92416 lines of grid box center coordinates (latitude, longitude) with corresponding climate class abbreviated according to the climate classification established by Köppen and Geiger," can be downloaded as well.

Shape files for use in GIS and a KMZ file for use in Google Earth are also available from the site.