Ghosts

The "ghosts" to which the speaker refers in Line 4 symbolize the past, specifically the speaker's sensual past that she spent with her various lovers. The speaker says that the ghosts exist within the rain that strikes her window, cultivating a sense of death and haunting around her now-lonely bedroom that used to be full of vitality.

The Lonely Tree

The "lonely tree" to which the speaker compares herself in Line 9 symbolizes the speaker's own state of isolation. She describes the tree, once full of birds, now standing empty and feeling its branches mourn for the lost presence of life. The speaker, too, mourns the loss of life and energy that once graced her past in the form of lovers in her bed.

Summer

Summer symbolizes youth and excitement. The speaker announces at the end of the poem that though she cannot remember the specific lovers she...