6-8 ET EF ET Cfb Dfc Dfa Cfa Dfb Af Aw Csb Aw Af BS BSk Am Aw Aw Cfa ET TROPIC OF CANCER BSh Cs Cfb ARCTIC CIRCLE Af Cfc Dfb Dfc Dwc Dwd Dfd Dwb BSk Cwa ETH BWk BSk BWk BSh BWh BS Aw Am Aw Bsh BWh Aw Dwd ET ET Dfc Cfb Cfa Cfc Dfb Cfb Af Af Aw Cfa BWh Csb Cfb ANTARCTIC CIRCLE EF ET Cfb Csb BSh Cw Aw Bsh EQUATOR TROPIC OF CAPRICORN Aw Af Cfa Af Cwa BS Csb Aw Af Cfb BS EF Csa 180 150 120 90 60 30 0 30 60 90 120 150 180 75 60 45 30 15 0 15 30 45 60 180 150 EAST 120 90 60 30 0 30 60 90 120 WEST 150 180 75 60 45 30 15 0 15 30 45 60 CLIMATIC  TYPES  OF  THE  EARTH  (after Koppen) .. LEGEND TO CLIMATIC TYPES A. TROPICAL RAINY CLIMATES Af Am Aw B. DRY CLIMATES BW BS h k k' n C. WARM TEMPERATE RAINY CLIMATES Cs Cw Cfa Cfb Cfc SUMMER-DRY WINTER-DRY WITHOUT DRY SEASON, HOT SUMMERS WITHOUT DRY SEASON, WARM SUMMERS WITHOUT DRY SEASON, COOL SUMMERS DESERT CLIMATE STEPPE CLIMATE Denotes a Hot B Climate Denotes a Cool B Climate Denotes a Cold B Climate Denotes a B Climate with Frequent Fog TROPICAL RAIN FOREST CLIMATE TROPICAL MONSOON CLIMATE TROPICAL SAVANNA CLIMATE D. COOL SNOW-FOREST CLIMATES (BOREAL) Dfa, Dwa Dfb, Dwb Dfc, Dwc Dfd, Dwd w f HOT SUMMERS WARM SUMMERS COOL SUMMERS VERY COLD WINTERS Denotes a Dry Season in Winter Indicates the Absence of a Dry Season E. POLAR CLIMATES ET EF H TUNDRA CLIMATE FROST CLIMATE Denotes Polar Climates E due to High Altitude { { { { { AG5f 0602 Figure 6-2.—Köppen’s climatic types. Basis for Classification Climate Group Poleward Boundary Temperature A. Tropical Frost  line  over  continents  and  65F  (18C)  over  oceans  (coolest months) Precipitation B. Dry Bounded by the outer limits where potential evaporation is equal to precipitation Temperature C. Subtropical 50F (10C) or above for 8 months of the year Temperature D. Temperature 50F (10C) or above for 4 months of the year Temperature E. Boreal 50F (10C) or above for 1 month (warmest month) Temperature F. Polar Below 50F (10C) entire year Table 6-2.—Trewartha's Climatic Groups and their Poleward Boundaries