You can quickly copy weather reports to other applications by dragging.
Choose Window > Weather Reports.
To copy a single report to a document in another application (TextEdit or any other applications accepting text), drag its header row from the Weather Reports window to the document window.
To copy multiple reports, select them by holding the Command or Shift key while clicking their header rows and drag the selection to a document window.
To copy all the reports, choose Edit > Select All and drag the selection to a document window.