This is a messed up setting probably saved in your preferences.
Please go to the Flight configuration screen. In the Weather box, click the customize button. Expand the right sections as much as you can and try to get a screenshot of all the settings. Send that and the log as a bug report so LR can investigate reproducing this.
Then to get flying again, you can reset your preferences by moving, renaming or deleting the entire preferences folder (found in the output folder).