Group A - Humid Tropical Climates

Winterless climates; All months have a mean temperature above 18°C
Weather Influences: ITC, Trade winds, Subtropical High Pressure Belt
Air Masses: cT, mT, cE, mE

Af - Wet Tropics:

Am - Wet Tropics:

Aw - Tropical Wet and Dry:

Group B - Dry Climates

Climates where evaporation exceeds precipitation; constant deficiency of water
Air Masses: cP, mP, cT, mT
Weather Influences: Subtropical High Pressure Belt, Polar Front, Wave Cyclones, Prevailing Westerlies

BWh - Dry Low Latitude:

BSh - Dry Low Latitude:

BSk, BWk - Dry Mid-Latitude:

Group C - Humid Mid-Latitudes

Mild winters; average temperature of coldest month is below 18°C, but above -3°C.
Air Masses: cP, mP, cT, mT air masses
Weather Influences: Subtropical High Pressure Belt, Polar Front, Wave Cyclones, Prevailing Westerlies

Csa, Csb - Dry-Summer Subtropics:

Cfa - Humid Subtropics:

Cfb, Cfc - Marine West-Coast:

Group D - Humid Mid-Latitudes

Severe winters; average temperature of coldest month is below -3°C, and the warmest monthly mean is above 10°C.
Air Masses: cA, mA, cP, mP, cT, mT
Weather Influences: Polar Front, Wave Cyclones, Prevailing Westerlies

Dfa, Dwa, Dfb, Dwb - Humid Continental:

Dfc - Subarctic:

Group E - Polar Climates

Summerless climates; average temperature of the warmest month is below 10°C.
Air Masses: cA, mA, cP, mP
Weather Influences: Polar Front, Wave Cyclones, Polar Easterlies

ET - Tundra:

EF - Ice Cap:

H - Highland Climate

Occurs in higher elevation terrains
No common latitude
Common characteristics:
High elevation
Lower air pressure/density
More intense insolation
Temperature is generally lower than neighboring climates but varies widely from highland area to highland area.
Precipitation can be very low to very high
Orographic precipitation / Rain shadow effects are common

Microclimates

Small variations in the climate due to small changes in:
Elevation
Insolation
Temperature
Wind direction
Compass orientation of the slope.

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