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

[TheClimateChanger]

On 6/8/2025 at 6:35 AM, chubbs said:

Your in denial mode. These two charts fit together well. The station moves at Coatesville and West Chester produce spurious cooling if they are left in the raw data. That's why NOAA matches raw data without station moves and you (COOP station avg) don't. You have Chester County as warm as the Philadelphia airport before the station moves. How silly is that.

@chubbs - this is all a bunch of subterfuge. In the vast majority of cases, NOAA systematically reduces the reported temperatures from the observed temperatures on a county-by-county basis, often in ways that make little logical sense. Chester County may very well be the only county in Pennsylvania where the opposite is true. So if there is a conspiracy, it's in the opposite direction as the one presupposed with this analysis.

 

 

 

[TheClimateChanger]

Let's look at May 2025:

xMacis reveals three NOAA stations in Chester County, with a mean temperature of 61.5F. So it's true that the reported mean temperature is higher than the mean of these three stations. But the opposite is true in just about every other county in Pennsylvania.

[bdgwx]

And at the global level the net effect of all adjustments actually reduces the overall warming trend.

[Haufather 2017]

[chubbs]

21 hours ago, TheClimateChanger said:

@chubbs - this is all a bunch of subterfuge. In the vast majority of cases, NOAA systematically reduces the reported temperatures from the observed temperatures on a county-by-county basis, often in ways that make little logical sense. Chester County may very well be the only county in Pennsylvania where the opposite is true. So if there is a conspiracy, it's in the opposite direction as the one presupposed with this analysis.

 

 

 

The Chester County deep-dive has shown that a county station average is a terrible way to evaluate NOAA. The available stations aren't designed to produce county averages by simple averaging and the stations change with time. The average shelf life of a coop station isn't very long. Even stations with long-term records have station moves and equipment changes.

The NOAA method is well proven for getting the right answer from a constantly changing station network. If the stations didn't change then simpler methods would also work; but, as we have seen in Chester County the simpler methods breakdown when there are large changes in the station network with time.