Sometimes a weather station will not  update for a few hours for unknown reasons obviously beyond our control.  This can sometimes cause patterning issues if the weather changed in that time period.  

Because of this, when WISE syncs the weather up, it could match up an image with weather that is 4+ hours old, which isn't always bad, but could skew your data. 

To eliminate this "bad data", choose the "Time Diff" when creating a weather report.

Then in the "View Reports" section, create a custom filter on the "Time Diff" field so that only records within n minutes are used.  This could be 60 minutes, 120 minute, whatever you are comfortable with.

In the above example image, the custom filter uses a less than AND a greater than value.  This will mean that it will filter down to only images with weather records within 60 minutes before and 60 minutes after the initial activity.