An index that classifies the climate of winemaking region based on growing degree days. The amount of degree days over 50°F, during the growing season, April 1st to October 31st in the northern hemisphere and October 1 to April 30 in the southern hemisphere. For each degree over 50°F the region received one degree day. This number is then added and the sum indicated the climate zone for the region:


Divided into six climate zones

Region Ia - 1500 to 2000°F degree days (850 to 1111°C)

Region Ib - 2001 to 2500°F degree days (1112 to 1389°C)

Region II - 2501 to 3000°F degree days (1390 to 1667°C)

Region III - 3001 to 3500°F degree days (1668 to 1944°C)

Region IV - 3501 to 4000°F degree days (1945 to 2222°C)

Region V - 4000 to 5000°F degree days (2223 to 2700°C)


Central Otago, New Zealand

Champagne, France

Kent, England

Kremstal, Austria

Leelanau Peninsula, Michigan

Nova Scotia, Canada

Okanagan Valley, Canada

Puget Sound, Washington

Rio Negro, Argentina

Ruwer, Germany

Sussex, England

Tasmania, Australia

Valais, Switzerland


Adelaide Hills, Australia

Alsace, France

Baden, Germany

Burgundy, France

Central Coast, California

Muscadet, France

Marlborough, New Zealand

Niagara Peninsula, Canada

Rhine Valley, Germany

Ribera del Duero, Spain

Savoie, France

Tokaj, Hungary

Willamette Valley, Oregon

Yarra Valley, Australia


Alto Adige, Italy

Bordeaux, France

Columbia Valley, Washington

Coonawarra, Australia

Curico Valley, Chile

Douro Valley, Portugal

Hawke's Bay, New Zealand

Piedmont, Italy

Rias Baixas, Spain

Walker Bay


Barossa Valley, Australia

Clare Valley, Australia

Friuli, Italy

Margaret River, Australia

McLaren Vale, Australia

Mendocino, California

Monticello, Virginia

Northern Rhone, France

Paso Robles, California

Rioja, Spain 

Rutherglen, Australia

Sonoma Valley, California

Thracian Valley, Bulgaria

Umbria, Italy


Alentejo, Portugal

Catalunya, Spain

Corsica, France

Hunter Valley, Australia

Lisbon, Portugal

Languedoc, France

Napa Valley, California

Northern Sonoma, California

Roussillon, France

Southern Rhone, France

Stellenbosch, South Africa

Tuscany, Italy

Veneto, Italy


Jerez, Spain

Lodi, California

Madeira, Portugal

Puglia, Italy

Patras, Greece

Sardinia, Italy

Sicily, Italy