Regional Climate Zone, Planting Map for the US

Climate of the United States

Each hemisphere of the Earth is neatly separated into three distinct climate zones.  These climate regions or zones are the tropical, temperate and polar zones.  Below see photos of climate regions.   This can be used as a helpful tool for planting a successful garden.

Climate of the United States
Climate Region Map of the US

Pictured above is a Climate Region Chart, Map of the United States.  The various climate definitions below give general guidelines for various climate zones based on average temperatures, precipitation and heating degrees.  Look at the various climate charts to find the region you live in.

Hot-Humid

A hot-humid climate is generally defined as a region that receives more than 20 in. (50 cm) of annual precipitation and where one or both of the following occur:

  • A 67°F (19.5°C) or higher wet bulb temperature for 3,000 or more hours during the warmest 6 consecutive months of the year; or
  • A 73°F (23°C) or higher wet bulb temperature for 1,500 or more hours during the warmest 6 consecutive months of the year.

Mixed-Humid

A mixed-humid climate is generally defined as a region that receives more than 20 in. (50 cm) of annual precipitation, has approximately 5,400 heating degree days (65°F basis) or fewer, and where the average monthly outdoor temperature drops below 45°F (7°C) during the winter months.

Hot-Dry

A hot-dry climate is generally defined as a region that receives less than 20 in. (50 cm) of annual precipitation and where the monthly average outdoor temperature remains above 45°F (7°C) throughout the year.

Mixed-Dry

A mixed-dry climate is generally defined as a region that receives less than 20 in. (50 cm) of annual precipitation, has approximately 5,400 heating degree days (65°F basis) or less, and where the average monthly outdoor temperature drops below 45°F (7°C) during the winter months.

Cold

A cold climate is generally defined as a region with approximately 5,400 heating degree days (65°F basis) or more and fewer than approximately 9,000 heating degree days (65°F basis).

Very-Cold

A very cold climate is generally defined as a region with approximately 9,000 heating degree days (65°F basis) or more and fewer than approximately 12,600 heating degree days (65°F basis).

Subarctic

A subarctic climate is generally defined as a region with approximately 12,600 heating degree days (65° basis) or more.

Marine

A marine climate is generally defined as a region that meets all of the following criteria:

  • A mean temperature of coldest month between 27°F (-3°C) and 65°F (18°C)
  • A warmest month mean of less than 72°F (22°C)
  • At least 4 months with mean temperatures more than 50°F (10°C)
  • A dry season in summer. The month with the heaviest precipitation in the cold season has at least three times as much precipitation as the month with the least precipitation in the rest of the year. The cold season is October through March in the Northern Hemisphere and April through September in the Southern Hemisphere.

(research courtesy of the US Department of Energy) – http://energy.gov/

Planting Climate Region
North American Hygrothermal Map

The Hygrothermal Regions Map above, illustrates the eight major climate zones in North America. The climate zones are generally based on heating degree-days, average temperatures and precipitation.

Now you know all about your zone!

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Author: tjsgarden

We are a family that loves the Arizona Desert. A lot of research and team efforts go into our articles and photos. Come discover the beauty and mystery with us. Don't forget your sunscreen!

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