New Zone Map will be more accurate

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darius So.App.Mtns., United States(Zone 5b) Aug 31, 2004

Could this be true? Or does this refer to the new and inaccurate map put out last year?

New Zone Map will be more accurate. The revised version of the USDA Hardiness Zone map will have many improvements, use more data and be more accurate, said Tony Avent, owner of Plant Delights Nursery in Raleigh, N.C., and a member of the map's advisory board.

The new map will be issued in two phases. Phase 1 will show average annual low temperatures by zone in 5-degree increments (a and b designations) and use weather data from the last 30 years. The current map, issued in 1990, uses 12 years of data. The new map will better reflect coastal and lake effects and urban heat islands, Avent said.

Phase 2 will incorporate overlay maps to reflect factors such as duration of cold, summer heat factors and possibly airflow patterns.

http://www.greenbeam.com/

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Cheryl_IL (Zone 5b) Aug 31, 2004

I didn't find the article you linked to, but I found this one, which makes me think it's different from the first draft.

http://www.greenbeam.com/features/weN060704.stm

Interesting site by the way - thank you.

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darius So.App.Mtns., United States(Zone 5b) Aug 31, 2004

There is SO much confusing information about Zones. My only intent in the post above was to remind folks their zones are not etched in stone.

After this summer... and what ever this winter may bring, we may all be concerned.

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TamaraFaye Fritch, TX(Zone 6b) Aug 31, 2004

..very interesting, thanks Darius & Cheryl

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