She's got the right color scheme, and spends most of the movie trying to bring back summer. I feel she represents it the same way her sister represents winter.

Probably.

I think she was. She love play in summer and her kingdom's flag is sun. Anna and Ariel represent spring.

Her and Ariel. Rapunzel and Anna represents spring to me.

Anna represents summer to me, or maybe spring too

I think so.

Anna and Ariel could also work.

I agree with Sparklefairy.

Any of them could work, but I also associate summer with water and beaches, so I think Ariel fits this season the most.

^ I have to agree with that :D

She's always been a cheerful one to me. Ariel has a summer-like spirit.

How is Anna not on top?

^ that bug on your icon freaked me out so much!

The movie is mostly sunny after all. :D Though Anna would be my next choice.

Her personality is so happy and summer like, and the setting of the movie helps. "Raindrops on roses and whiskers on kittens" For some reason comes to mind when thinking about her :D