Lyric discussion by RedBullet 

Cover art for Landscape lyrics by Florence + the Machine

I think that this is about a girl who had a sibling that she was close with. Her brother/sister committed suicide and she's grieving (It's all painted in her grief). Her life feels empty without her sibling and she wants them back because her sibling was the only kind one in her family. Now she's unstable, her emotions constantly changing like the weather. Born from dark water probably means that she was born under unfavorable circumstances (like, her mom accidentally got pregnant with her). I think that daughter of the rain and snow is referring to her parents. Her mother is the rain, because she's always crying and grieving over the loss of her other child and their father is the snow, which means that always working and he's never in the house. Snow just says that he's a cold and distant figure. The sibling's death is tearing apart their family (It's cutting down the family tree). The girl wants all this madness to stop but at the same time, she's afraid of what will happen if it does stop.I think the lighthouse bit is about a person she was seeing that gave her advice. When she goes to look for that person, they're gone. Either they left or they died. I can't be sure. Someone else is talking about the girl in that part about the open sky. They want to help the girl. She is thinking of committing suicide (You put the gun into your mouth to bite). The girl stops herself at the last second and realizes that killing herself will bring only more pain to her family.

And that's what I think.

My Interpretation