Individual,please pay attention to the word "weak" in the context, your explanation was obviously not proper. But thanks for reply.
Hi sozobe, I've suspected "hurt by aging lineup" was another aspect. But this text was so close to its title, so the usage seems unusual.
In addition, because the writer pointed out at the same time "Japanese competitors Toyota and Nissan both scored impressive gains". If it were hit by weather, and if "the aging lineup" meant what you explained for it, Japanese car sales might decline in January too.
So I'm afraid your explanation for both "hit by weather' and "hurt by the aging lineup" seems not held water very well.
(But to tell the truth, I'd like to adopt your opinion, thanks
)
Here is the link for the article from which the question occurred.
http://www.reuters.com/financeNewsArticle.jhtml?type=businessNews&storyID=4277732