Is The U.S. Surface Temperature Record Reliable?


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Is The U.S. Surface Temperature Record Reliable?


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The stakes in the debate over global warming are high. If human activities are causing a major warming of the earth’s atmosphere, then actions to reduce greenhouse gas emissions costing hundreds of billions of dollars would be necessary.

But how do we know if global warming is a problem if we can’t trust the temperature record?

This report, by meteorologist Anthony Watts, presents the results of the first-ever comprehensive review of the quality of data coming from the National Weather Service’s network of stations. Watts and a team of volunteers visually inspected and took pictures of more than 850 of these temperature stations. What they found will shock you:

We found stations located next to the exhaust fans of air conditioning units, surrounded by asphalt parking lots and roads, on blistering-hot rooftops, and near sidewalks and buildings that absorb and radiate heat. We found 68 stations located at wastewater treatment plants, where the process of waste digestion causes temperatures to be higher than in surrounding areas.

In fact, we found that 89 percent of the stations nearly 9 of every 10 fail to meet the National Weather Service’s own siting requirements …

The conclusion is inescapable: The U.S. temperature record is unreliable. And since the U.S. record is thought to be the best in the world, it follows that the global database is likely similarly compromised and unreliable.

Additional information

Weight 0.35 lbs
Dimensions 11 × 8.6 × 0.2 in

Anthony Watts


28 Pages


Publication Date

February 01, 2009

1 review for Is The U.S. Surface Temperature Record Reliable?

  1. Gordon “GHB”

    Expose some of data corruption on Global Warming
    This is a very well done documentation with lots of pictures of sites where temperature data is recorded. It exposes the poor scientific methods used at these sites. Recording temperatures over blacktop driveway, at hot spot near power stations, air conditioning units etc.

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