[Answer] The USDA hardiness zones are determined by what?

Step 1 : Introduction to the question "The USDA hardiness zones are determined by what?"

...One of the most useful guides for gardeners in the United States is the USDA zone map, which organizes the country into zones based on the minimum average annual temperature. A 10-degree range separates each zone, and the lower the zone number, the lower the average annual temperature. For example, frigid states such as Alaska, Minnesota, and Maine see some of the coldest zones, from 1a to 4b, while the Southeast and Southwest see the highest zones, 6a through 13b.

Step 2 : Answer to the question "The USDA hardiness zones are determined by what?"

Minimum average temperature:

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