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Koppen Climate Classification Modified System

 

A

Climates

 

 

Tropical Climates

 

  • Moist (Annually:  PRECIP > PET)
  • No Cold Season
  • Dominates the Equatorial Regions.
  • Temperature Range:

 

 

 

B

Climates

 

 

Dry Climates

 

  • Dry (Annually: PET > PRECIP)
  • Subtypes:  BS Climate (Semi-Arid)

                         BW Climate (Arid)

  • Temperature Range:

 

 

C

Climates

 

 

Warm Midlatitude

Climates

 

  • Moist (Annually:  PRECIP > PET)
  • Lower Midlatitudes
  • Moderate seasonality
  • Temperature Range:

 

 

 

 

D

Climates

 

 

 

 

Cool Midlatitude

Climates

 

  • Moist (Annually:  PRECIP > PET)
  • Higher Midlatitudes
  • Strong Seasonality

o       Approximately corresponds to locations with at least one month of continuous snow cover or frozen ground.

o       Extends to the poleward limit of tree growth.

  • Temperature Range:

 

 

E

Climates

 

 

 

Polar Climates

 

  • No “True” Summer.  (Summer remains too cold for tree growth)
  • Subtypes:  ET Climate (Tundra)

                         EF Climate (Ice Cap)

  • Temperature Range:

 

H

Climates

 

 

Highlands

 

  • Climatic conditions in mountains and high plateaus.
  • Altitude is more significant than latitude.
  • Conditions vary greatly.

 

Precipitation Subgroups

 f

 

  • constantly moist (year-round rainfall)
  • no dry season

 

w

 

  • winter dry (dry season is in the low-sun months)
  • summer wet (wet season is in the high-sun months)

 

 s

 

  • summer dry (dry season is in the high-sun months)
  • winter wet (wet season is in the low-sun months)

 

 

Temperature Subgroups

a

 

  • hot summer

 

b

 

  • warm summer

 

c

 

  • cool, short summer

 

d

 

  • cool, short summer
  • very cold winter

 

h

 

  • dry climate, with hot year-round

 

k

 

  • dry climate, with cold winter

 

Last Updated: 12/09/2014
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