Interactive United States Köppen Climate Classification Map

Legend
  • Af
  • Am
  • Aw
  • BWh
  • BWk
  • BSh
  • BSk
  • Csa
  • Csb
  • Cwa
  • Cwb
  • Cwc
  • Cfa
  • Cfb
  • Cfc
  • Dsa
  • Dsb
  • Dsc
  • Dsd
  • Dwa
  • Dwb
  • Dwc
  • Dwd
  • Dfa
  • Dfb
  • Dfc
  • Dfd
  • ET
  • EF

Describe US Classifications

Class A - Tropical Climates

Class A climates are characterized by constant high temperatures (at sea level and low elevations) with year round average temperatures of 18 °C (64.4 °F) or higher. In the United States, class A tropical climates are found in South Florida, Hawaii, Puerto Rico and the US Virgin Islands.
Class Name Description US Cities in This Class
AfTropical Rainforest Year–round average precipitation of at least 60 mm (2.4 in). Usually occur within 5–10° latitude (North and South) of the equator. In some Eastern-coast areas, they may extend to as much as 25° away from the equator. This climate is dominated by the doldrums low-pressure system all year round, so has no natural seasons.
AmTropical Monsoon This type of climate, most common in South America, results from the monsoon winds which change direction according to the seasons. This climate has a driest month (which nearly always occurs at or soon after the "winter" solstice for that side of the equator) with rainfall less than 60 mm, but more than 1/25 the total annual precipitation.
AwTropical Savanna (Wet and Dry Climate) These climates have a pronounced dry season, with the driest month having precipitation less than 60 mm and less than 1/25 of the total annual precipitation.
  • Key West, Florida
  • Naples, Florida
  • Marco Island, Florida

Class B - Dry (Arid and Semiarid) Climates

Class B Climates are characterized by potential evaporation and transpiration exceeding precipitation. These climates are usually found in areas from 20 - 35° North and South of the equator and in large continental regions of the mid-latitudes often surrounded by mountains.
Class Name Description US Cities in This Class
BWh Hot Desert ClimateTmin ≥ +18 °C
BWk Cold Desert ClimateTmin ≥ +18 °C
BSh Hot Semi-Arid ClimateTmin ≥ +18 °C
BSk Cold Semi-Arid ClimateTmin ≥ +18 °C

Class C - Temperate (Mesothermal) Climates

Class C climates have an average monthly high temperature of 10 °C (50 °F) or more in the spring/summer months (April to September in northern hemisphere), and an average monthly low temperature greater than −3 °C (27 °F) in the fall/winter months.
Class Name Description US Cities in This Class
Csa Hot-Summer Mediterranean Climate Csa Mediterranean Climates mostly occur on the western sides of continents between the latitudes of 30° and 45°.[6] These climates are in the polar front region in winter, and thus have moderate temperatures and changeable, rainy weather. Summers are hot and dry, due to the domination of the subtropical high pressure systems, except in the immediate coastal areas, where summers are milder due to the nearby presence of cold ocean currents that may bring fog but prevent rain.
Csb Warm-Summer Mediterranean ClimateTmin ≥ +18 °C
Cwa Humid Subtropical ClimateTmin ≥ +18 °C
Cwb Subtropical Highland Climate Tmin ≥ +18 °C
Cwc Subtropical Highland ClimateTmin ≥ +18 °C
CfaHumid Subtropical ClimateTmin ≥ +18 °C
CfbOceanic ClimateTmin ≥ +18 °C
CfcSubpolar Oceanic ClimateTmin ≥ +18 °C

Class D - Continental (Microthermal) Climates

These climates have an average temperature above 10 °C (50 °F) in their warmest months, and a coldest month average below −3 °C (or 0 °C in some versions, as noted previously). These usually occur in the interiors of continents and on their upper east coasts, normally north of 40°N. In the Southern Hemisphere, group D climates are extremely rare due to the smaller land masses in the middle latitudes and the almost complete absence of land at 40–60°S, existing only in some highland locations.
Class Name Description US Cities in This Class
DsaHumid Continental Climate - Dry Warm Summer Tmin ≥ +18 °C
Dsb Humid Continental Climate - Dry Cool Summer Tmin ≥ +18 °C
Dsc Continental Subarctic - Cold Dry Summer Tmin ≥ +18 °C
Dsd Continental Subarctic - Dry Summer, Very Cold Winte Tmin ≥ +18 °C
DwaHumid Continental Hot Summers With Dry WintersTmin ≥ +18 °C
DwbHumid Continental Mild Summer With Dry WintersTmin ≥ +18 °C
DwcSubarctic With Cool Summers And Dry WintersTmin ≥ +18 °C
DwdSubarctic With Cold Winters And Dry WintersTmin ≥ +18 °C
Dfa Humid Continental Hot Summers With Year Around PrecipitationTmin ≥ +18 °C
Dfb Humid Continental Mild Summer, Wet All YearTmin ≥ +18 °C
Dfc Subarctic With Cool Summers And Year Around Rainfall Tmin ≥ +18 °C
Dfd Subarctic With Cold Winters And Year Around RainfallTmin ≥ +18 °C

Class E - Polar and Alpine Climates

These climates are characterized by average temperatures below 10 °C in all 12 months of the year. These climates only occur in the United States in the along the North coast of Alaska.
Class Name Description US Cities in This Class
ET Tundra Climate Warmest month has an average temperature between 0 and 10 °C. These climates occur on the northern edges of the North American and Eurasian land masses, and on nearby islands. ET climates are also found on some islands near the Antarctic Convergence, and at high elevations outside the polar regions, above the tree line.
EF Ice Cap ClimateThis climate is dominant in Antarctica and inner Greenland, but also occurs at extremely high altitudes on mountains, above even tundra. All twelve months have average temperatures below 0 °C (32 °F)

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