A paper describing the method used to produce the map and a discussion of the resultant map can be found at the peer-reviewed journal Hydrology and Earth Systems Sciences.
Here you are able to download the paper (free of charge, since HESS in an open access journal) along with the map as an image file (.jpg) and as a raster file (ArcMap) from the Supplement section (again free of charge).
When you unzip the supplementary file, make sure that the option for unzipping to sub-folders (or sub-directories) is turned on, otherwise ArcMap may not recognise the raster file.
The complete reference to cite when using this map is :
Peel MC, Finlayson BL & McMahon TA (2007), Updated world map of the Köppen-Geiger climate classification, Hydrol. Earth Syst. Sci., 11, 1633-1644.
Two GoogleEarth layers (*.kml) of the map are available basic info version and detailed info version. Save the link to your computer and open the kml file in GoogleEarth. [Thanks to Gerrit Hendriksen for the detailed info version].
Individual continental maps from the paper are available here in jpg (Africa, Asia, North America, South America, Europe & Milddle East, Australia) and eps (Africa, Asia, North America, South America, Europe & Milddle East, Australia) format.
An ascii version of the published ArcMap raster file is available from here. Both the ArcMap raster and the ascii raster use the GCS_WGS_1984 projection in ArcMap (0.1 x 0.1 degree resolution).
Yes! Please use the map for non-commercial purposes and cite "Peel et al (2007)" and the reference above. If you adapt or modify the map, cite "Adpated from Peel et al (2007)" and the reference above.
Hydrology and Earth Systems Sciences is published under a Creative Commons Attribution, NonCommercial and ShareAlike License. This means that you are free to use and adapt the map so long as you abide by the terms of the License (acknowledge the original source & non-commercial use), which is why we chose to publish the map in this journal.
Yes! The monthly precipitation and temperature data used to construct the map are available for free download from the Global Historical Climatology Network, Version 2.
Caspian Sea - The area covered by the Caspian Sea should not have any climate types. It should be white like the nearby Black Sea.
Reunion - Indicated as Af, should be Am. [Thanks Josh].
Mauritius - Indicated as Af, should be Aw. [Thanks Josh].
Greek Islands: Santorini & Anafi - Indicated as BWh, based on Koutsoyiannis et al (2008) should be BSh. [Thanks Panos].
Rules for C and D climates: Thot > 10 should be Thot ≥ 10. During production of the map Thot ≠ 10 at any location, so this error did not affect the map.
Elevated areas of Santa Catarina, Brazil - Due to a lack of precipitation and temperature stations in this region, the zone of Cfb would likely include the areas of higher elevation (1000m - 1500m), which are currently indicated to be Cfa. [Thanks Fábio]
Colombia - we only had six precipitation and temperature stations in Colombia on which to base the interpolation across rugged terrain, which is likely to result in a poor representation of the true climate types in Colombia. [Thanks Carlos]
Albania - we did not have any precipitation and temperature stations in Albania on which to base the interpolation, which is likely to result in a poor representation of the true climate types in Albania. [Thanks Dritan]
A description of the climate types and the rules used to calculate the climate types is given in Table 1 of Peel et al (2007), which is reproduced below. The units are precipitation in millimeters (mm) and temperature in degrees Celsius (oC).
1st 2nd 3rd Description Criteria* Raster Pixel values
A Tropical Tcold ≥ 18
f - Rainforest Pdry ≥ 60 Af = 1
m - Monsoon Not (Af) & Pdry ≥ 100–MAP/25 Am = 2
w - Savannah Not (Af) & Pdry < 100–MAP/25 Aw = 3
B Arid MAP < 10×Pthreshold
W - Desert MAP < 5×Pthreshold
S - Steppe MAP ≥ 5×Pthreshold
h - Hot MAT ≥ 18 BWh = 4 & BSh = 6
k - Cold MAT < 18 BWk = 5 & BSk = 7
C Temperate Thot ≥ 10 & 0 < Tcold < 18
s - Dry Summer Psdry < 40 & Psdry < Pwwet/3
w - Dry Winter Pwdry < Pswet/10
f - Without dry season Not (Cs) or (Cw)
a - Hot Summer Thot ≥ 22 Csa = 8, Cwa = 11 & Cfa = 14
b - Warm Summer Not (a) & Tmon10 ≥ 4 Csb = 9, Cwb = 12 & Cfb = 15
c - Cold Summer Not (a or b) & 1 ≤ Tmon10 < 4 Csc = 10, Cwc = 13 & Cfc = 16
D Cold Thot ≥ 10 & Tcold ≤ 0
s - Dry Summer Psdry < 40 & Psdry < Pwwet/3
w - Dry Winter Pwdry < Pswet/10
f - Without dry season Not (Ds) or (Dw)
a - Hot Summer Thot ≥ 22 Dsa = 17, Dwa = 21 & Dfa = 25
b - Warm Summer Not (a) & Tmon10 ≥ 4 Dsb = 18, Dwb = 22 & Dfb = 26
c - Cold Summer Not (a, b or d) Dsc = 19, Dwc = 23 & Dfc = 27
d - Very Cold Winter Not (a or b) & Tcold < –38 Dsd = 20, Dwd = 24 & Dfd = 28
E Polar Thot < 10
T - Tundra Thot > 0 ET = 29 (& 31 if elevation > 1500m)
F - Frost Thot ≤ 0 EF = 30 (& 32 if elevation > 1500m)
* MAP = mean annual precipitation, MAT = mean annual temperature, Thot = temperature of the hottest month, Tcold = temperature of the coldest month, Tmon10 = number of months where the temperature is above 10, Pdry = precipitation of the driest month, Psdry = precipitation of the driest month in summer, Pwdry = precipitation of the driest month in winter, Pswet = precipitation of the wettest month in summer, Pwwet = precipitation of the wettest month in winter, Pthreshold = varies according to the following rules (if 70% of MAP occurs in winter then Pthreshold = 2 x MAT, if 70% of MAP occurs in summer then Pthreshold = 2 x MAT + 28, otherwise Pthreshold = 2 x MAT + 14). Summer (winter) is defined as the warmer (cooler) six month period of ONDJFM and AMJJAS.
