Yesterday I did a post looking at every station and finding out which year had the hottest July. Today I am showing you what effect the adjustments have.
I am using USHCN Final Tmax monthly data and comparing it to the raw data . From the file v188.8.131.5240627. (This is not necessarily all the data NOAA uses)
The format is a little different, but it is designed to allow easy comparison. Red is the raw data. Green is Final and muddy green is where raw and final overlap.
As you can see, the number of years near the present have a lot green. Which means the adjustments created more record hot years.
The 1910s to 1980s have red at the top which indicates raw data. Translation: More record July’s occurred in the past using raw data.
For the Coldest July data, the results are the opposite. Adjusting creates more colder July’s in the past and takes away cold July’s from the present.