The current weather information reports from http://www.intellicast.com/Local/ . It appears that intellicast does not have the option to view past weather days as a history.
It would be ideal to be able to customize where BIM360 gets it's weather data from including the use of an on the job Weather Station. Many jobs may use a Davis Weather Station (or something similar) that has the ability to report data via the web/apps/etc.
This would avoid having the Superintendent edit the weather data in Daily Updates on a daily basis.