long day vs short day onions

hi group,
 
i  recently heard about the difference between long-day and short-day onions. Rebecca Kolls said if you live north of Oklahoma to get the long-day onions and below that state, to get the short-day onions. 
 
i'm not really interested in growing onions, but what was interesting to me was that the dividing line for day lgths in the summer runs through the state of Oklahoma.  have you ever heard or read anything about this?  does it apply to other plants?  how much do the day lgths differ between my latitude of 45deg and say atlanta, ga?
 
thanks,
cindy johnson
white bear lake, mn
zone 4a
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