Duplicate Rainfall Error

Seems like there has been an error out there for some time where more than one rainfall recording was made for the same day.

This problem caused the following message to be shown

Item has already been added. Key in dictionary: '2010-02-05'  Key being added: '2010-02-05'

I have put in a fix which should stop the error message from showing, however the underlying reason why two entries were made for the same date still exists.
If you have been able to make multiple recordings on the same day, then please post a comment how. Or drop an email via the feedback form.