The US Environmental Protection Agency (EPA) has recorded annual heat waves (Heat Wave Index) in the US since 1895.
A heat wave is obviously an abnormally hot period.
The EPA definition of "heat wave" is more specific:
A heat wave is obviously an abnormally hot period.
The EPA definition of "heat wave" is more specific:
A period of at least four days with an average temperature so unusually hot that it would be expected to occur only once in every ten years (based on the historical US temperature record).
In the US the most heat waves occurred between 1930 and 1940.
Not many were before 1930, or after 1940.
The EPA's historical record of US heat waves used to generally agree with NASA‘s historical record of the US average temperature data.
It no longer does.
In 1999 NASA's average US temperature data were much closer to EPA observations of US heat waves than it was in 2014.
Why the change?
Because NASA has been gradually "adjusting" their historical temperature data to make the 1930s cooler, in a quiet effort to create "data" that supports their unproven 'CO2 is the climate controller' theory.
NASA temperature data are "adjusted" to support a theory -- nothing could be more anti-science.
The bogus NASA "adjustments" have been obvious: They are gradually making the hot 1930s disappear from historical US temperature records.
The coming global warming catastrophe belief is a secular religion, not science, led by left-wing politicians and climate modelers (climate astrologers) who are on their government payrolls.
The ONLY real danger from Earth's climate is from smarmy power-hungry left wing politicians who have falsely redefined CO2 plant food as "carbon pollution", and are using their false boogeyman to attack the use of inexpensive, reliable fossil fuels … and support expensive, unreliable, heavily government subsidized solar and wind power.
What we have in "climate science" is a bizarre situation where the past climate is constantly changing, as history is revised or political reasons … while scary predictions of the future climate have not changed for almost 40 years (runaway warming caused by CO2).
If it were up to me, politicians who demonize skeptics as "deniers", and falsely claim climate science is settled, as if science is ever settled, would spend a year in prison for needlessly frightening people with their self-serving coming climate change catastrophe hoax.