Chester County PA - Analytical Battle of Actual vs. Altered Climate Data

[Mike Cycle]

Paul, I don't know if you saw this, but the detected breaks for Coatesville line up very well with documented results.  I made a figure, attached.  HOMR has errors, you must refer to the 530-1, and even that has an error in Gordon's address which was resolved by looking at property records.  You will also need to read through every monthly report to catch changes in coords or observation times--I did.  Somewhere in ~1928 Gordon notes that he was ill and used chart recorder for a while--I ignored that.   If you don't supply all of this information to Claude, you will not get a useful result.

Don't expect the breakpoints to coincide exactly.  It may take a month or more for the break to be visible to the math.  

If you look at the map--its 100% clear and obvious that 1 SW moved from a hot location to progressively cooler ones.  It also clear you have not provided this information to the AI.