wrote:

I didn't feel the earthquake when most of New Jersey moved from zone 6
to zone 7 this year. See the link to the USDA site
http://www.ahs.org/publications/usda...zone_map.htm#1


The zones are supposed to be representative of local climate and are
based on the lowest expected winter temperatures averaged over a number
of years. The AHS site states that the averages for the updated map were
done for the years 1987 to 2001. I would expect that for this short a
period of time there would be large variations in the map.