Modified Koppen Classification System
Climatic Regions
A Climates: Humid Equatorial / Tropical
- 36% of the Earth's total surface
- Coolest month must be warmer than 64.4 degrees F
- Precipitation exceeds evaporation
MAP
- Af: all months receive >2.4 in. precip.[Tropical Rain
Forest]
- Am: a short dry season with at least 1 month < 2.4 in.
precip. [Tropical Monsoon]
- Aw: summer wet, winter dry [Tropical Savanna]
Modified Koppen Classification System
Climatic Regions
B Climates: Arid and Semi-Arid
- 35% of Earth's land surface
- Evaporation exceeds precipitation
MAP
- BW: desert / precipitation < 1/2 evaporation
- BS: semi arid / steppe / precipitation > 1/2
evaporation
Modified Koppen Classification System
Climatic Regions
C Climates: Humid Temperate
- 27% of Earth's total surface area
- 55 % of world's population
- Warmest month > 50 degrees F
- Coldest month > 32 degrees F but < 64.4 degrees F
MAP
- Cf: no dry season / all months > 1.2 in. precip.
- Cw: winter dry period
- Cs: Dry summer / "Mediterranean"
Modified Koppen Classification System
Climatic Regions
D Climates: Humid Cold
- 21% of Earth's land surface
(7% total surface)
- warmest month > 50 degrees F
- coldest month < 32 degrees F
- great variability in temperature
- snow climates
- only in mountains in the southern hemisphere
MAP
- Df: no dry period
- Dw: dry winter
Modified Koppen Classification System
Climatic Regions
E Climates: Polar Climates
- warmest month below 50 degrees F
- cold, ice climates
- tundra and ice cap
Modified Koppen Classification System
Climatic Regions
H Climates: Undifferentiated Highland