5 are highly correlated during summer months in some areas.
( 5 ( ( are ( highly ( correlated ( during ( ( summer months ) ( in ( some areas ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (CD 5)) (VP (VBP are) (ADJP (RB highly) (JJ correlated) (PP (IN during) (NP (NP (NN summer) (NNS months)) (PP (IN in) (NP (DT some) (NNS areas))))))) (. .)))
Five are correlated during the summer in certain areas.  
( Five ( ( are ( correlated ( during ( ( the summer ) ( in ( certain areas ) ) ) ) ) ) . ) )
(ROOT (S (NP (CD Five)) (VP (VBP are) (VP (VBN correlated) (PP (IN during) (NP (NP (DT the) (NN summer)) (PP (IN in) (NP (JJ certain) (NNS areas))))))) (. .)))