Extract particular months from List in R

Hi ALL,
I have a List object in R. The dataframes in the List have equal rows and columns.
How can I extract from the List, data corresponding to say c(June, July , August)?
Remember, it is a List object, containing 100 dataframes, with daily data arranged by YYMMDD.
Thanks for your thoughtful solutions.

An example would be helpful.
Is the date column a Date, some POSIX.. object, or just a string or 
numeric value?

In principle:
write a function that extracts data for these months from one data.frame 
and then lapply() it to the list.
Given you had provided a small example, we could have given you some 
more specific answer.

Best,
Uwe Ligges

AT.

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