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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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