[R] conditional sum two dataframes

[jcrosbie]

I have two data frames. One with a matrix of months and the other with a
matrix of values. The two dataframes correspond to each other. I would like
to sum up all the values in by month. 

What would be an efficient way to do this? 

a=C(2,3,5,2,3,5)
b=c(2,6,3,2,6,3)
c=c(2,6,7,2,6,5)

months <- data.frame(a,b,c)

a=C(200,345,5435,27456,3343,555)
b=c(288,699,377,234,6354,33454)
c=c(2345,6345,79678,245,676,5089)

values <- data.frame(a,b,c)




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