Re: USDA Climate Map

**B*@aol.com**

Greetings list:

>From the AUGUST 31, 2004 weekly NMPro newletter (Todd Davis, Editor):   

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.

Bob Polomski
South Carolina

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