ClearSCADA contains a Historian through which incoming data from remote devices can be historically recorded. The historian uses a proprietary database engine to store historic data associated with events and point data. This data can later be retrieved in the form of trends, lists or directly with SQL queries.

Trends are graphical displays that plot the values of database points and time profiles. They allow you to view and compare the values of points over a specific period of time. This is particularly useful when you need to determine if there are any patterns in the data, for example, you may need to compare the level of water in 3 different rivers over a month period.