How to detect the accuracy margin of error using Core Location

How to detect the accuracy margin of error using Core Location

I have an app that tracks user location using the following:
locationManager.distanceFilter = kCLDistanceFilterNone;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
According to Apple's documentation, Core Location will try to obtain the
best possible reading until I tell it to stop. However, I realize the
reading can be impaired by many uncontrollable things i.e. weather, device
in a building, etc.
For the purposes of my app, I would like to store how accurate the reading
actually was. For example, if I am in a field, I may get a reading that is
accurate up to 10 meters, but if I were in that same field during a
thunderstorm, I may get a reading that is accurate up to 100 meters.
Is there a way to detect how accurate my reading actually is?