sycasey said:
Eastern Oregon Bear said:
Why is he just cherrypicking data from April? What happened in the other 11 months?
If you're just looking at April data, why pick a peak month like April 1895? Why not April 1899 or April 1904 or just some month where it was fairly average and not an extreme?
Moreover, why only in the US? One month's data from one country doesn't prove s***.
It's not "one month's data", it's data from over a century. They probably used April as their month-to-month anchor because that was the latest current data, as we are in May. If cooling is observed in April over 100+ years, it would be highly unlikely that the same phenomenon would not be observed yearround.
Temperatures have been flat or declining in North America over the last several decades. And the US is not "just one country", it's a huge country making up the majority of the inhabitable land mass of N. America. As well, it is the most monitored large land mass in the world in terms of temperature measurements.
Most of the increase in temperatures recorded is due to weather stations being in urban settings, and more specifically, increased urbanization around these stations,
creating a more pronounced Urban Heat Island effect. For example, the area around a weather station like San Jose airport had a lot of orchards around it in the 1950s, 60s or even 70s that have been gradually replaced by asphalt and cement roads and buildings.
Most of the temperature increase observed in a station like this will come from increased local urbanization. This is a pattern observed not just in the rest of the country, and the rest of the world as well, as the majority of weather stations are located in or near urban areas.
The Urban Heat Island effect is a lot more dramatic in the rest of the country because the vegetation and tree cover is thicker, and the summer temperatures higher. For example, the difference between Central Park temperatures and urban Manhattan can be
as high as 20F-30F in Summer!... >>>This will completely skew averages collected over several decades meant to show difference in fractions of a degree.
https://www.nyc.gov/assets/dep/downloads/pdf/environment/education/10-analyzing-urban-heat-island-effect.pdfThis urbanization heating effect is clearly apparent in data by the Natl Climatic Data Center (NCDC):
This data has however been "normalized" with rural data being altered by the NCDC to
arbitrarily push up rural measurements:
Just one example of how easy it is to manipulate the data in the Climate Change sausage factory.
https://wattsupwiththat.com/2010/02/26/a-new-paper-comparing-ncdc-rural-and-urban-us-surface-temperature-data/
