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

[ChescoWx]

Wonder what is going on at KRDG since 2021?? Further north higher elevation than Phoenixville but now warmer than the Chesco warm spot.

[ChescoWx]

There are some who believe our nightime lows are getting warmer during the summer months. The actual data sees no such warming - almost flat since 1893!

[TheClimateChanger]

5 hours ago, ChescoWx said:

I love when climate zealots simply eliminate stations they deem absurd....LOL!

This is especially ironic coming from someone who normally claims NOAA’s modern records are bogus, adjusted, contaminated, or otherwise untrustworthy. But a lone 105°F reading from a high-elevation northern interior New York site in 1919, with surrounding stations reporting 88–94°F on the same date, is suddenly sacred scripture? And that was literally the only substantive change I made. The rest of the map is from Martz’s own website, just reassembled to show the most recent occurrence of a given high, with a couple of corrections for omissions (Maryland & NC in 2012) and updated to include 2025's record highs(map ends in 2024). Martz himself excludes 

[chubbs]

14 hours ago, TheClimateChanger said:

This is especially ironic coming from someone who normally claims NOAA’s modern records are bogus, adjusted, contaminated, or otherwise untrustworthy. But a lone 105°F reading from a high-elevation northern interior New York site in 1919, with surrounding stations reporting 88–94°F on the same date, is suddenly sacred scripture? And that was literally the only substantive change I made. The rest of the map is from Martz’s own website, just reassembled to show the most recent occurrence of a given high, with a couple of corrections for omissions (Maryland & NC in 2012) and updated to include 2025's record highs(map ends in 2024). Martz himself excludes 

The deep dive in Chester County has made me very suspicious of older high temperature records in the US. Non-aspirated thermometers used back in the day are sensitive to shelter placement. It only takes one poorly sited station on one day to make a max temperature statistic misleading. Phoenixville in Chester County is a good example. Much hotter max temperatures than surrounding stations for 20 years in the 1930s and 40s. Well documented in this thread.  As you show above, Martz's chart of nationwide high temperature records has the same problem. This whole thread is about using inconsistent data past vs present, to present misleading information.

[ChescoWx]

Many folks have asked for an analysis of both the Average Summer High temperature and Overall Average Temperature trends specifically for Chester County PA.

Clearly steady state since 1893!

[ChescoWx]

Are we already in our next cooling climate cycle for summer? Since 2010 summers now show a cooling trend!