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American Focus > Blog > Politics > Flaws in 150 Years of Global Temperature Data Blow Holes in Global Warming Narrative |
Politics

Flaws in 150 Years of Global Temperature Data Blow Holes in Global Warming Narrative |

Last updated: July 6, 2025 6:30 pm
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Flaws in 150 Years of Global Temperature Data Blow Holes in Global Warming Narrative |
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Photo: U.S. Forest Service firefighters battle a California wildfire. Text added by Antonio Graceffo. Original image in the public domain.

 

Questioning the Climate Narrative: Is the Data Reliable?

In the ongoing debate over climate change, one of the cornerstones of the liberal argument is the reported increase in average global temperatures, often cited as having risen by 1.1°C to 1.3°C (or 2.0°F to 2.3°F) since the pre-industrial era (1850–1900). The National Oceanic and Atmospheric Administration (NOAA) begins its climate record in 1880, asserting that temperatures have increased by approximately 1.1°C (2.0°F) since that time. Even NOAA concedes that early data has its limitations, stating, “Earth’s surface temperature has risen about 2 degrees Fahrenheit since the start of the NOAA record in 1850.”

However, the credibility of these claims is under scrutiny. A staggering 96% of U.S. temperature stations do not meet NOAA’s own criteria for proper siting. These stations are often located near urban development, leading to exaggerated temperature readings due to the urban heat island effect. Furthermore, the shift from mercury thermometers to digital sensors between the 1980s and 2000s has created data inconsistencies, particularly during a period characterized by alleged accelerated warming. Additionally, early temperature readings were predominantly taken from Europe and North America, neglecting vast areas, especially the oceans that cover 71% of our planet.

The measurement errors can reach ±0.5°C, often overshadowing the climatic changes they are meant to indicate. Even more concerning is the fact that much of the raw data has been adjusted or “homogenized” based on subjective assumptions, potentially introducing biases that could undermine the trends being studied. Together, these factors cast doubt on the accuracy needed to substantiate the minor temperature shifts that fuel today’s ambitious climate policies.

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Anthony Watts’ Surface Stations Project reveals that around 96% of temperature stations used to gauge climate change fail to meet NOAA’s own siting standards, as documented in studies like “Corrupted Climate Stations: The Official U.S. Surface Temperature Record Remains Fatally Flawed.” Watts and his team discovered that many stations are precariously located next to air conditioning exhausts, surrounded by asphalt, or perched on rooftops, leading to artificially inflated temperature readings. Alarmingly, data from well-sited stations suggests that the rate of warming in the U.S. is nearly half of what is reported across all stations, indicating that a considerable portion of the perceived warming may stem from poor measurement practices rather than genuine climate change.

The urban heat island effect presents one of the most significant flaws in temperature recording. Many weather stations, initially positioned in rural settings during the 1800s and early 1900s, are now engulfed by urban sprawl. Cities generate additional heat through concrete absorption, limited vegetation, and concentrated human activity, resulting in temperature readings that can be 2–5°F higher than those from surrounding rural areas. This phenomenon isn’t mere speculation; it’s grounded in fundamental physics. Urban landscapes retain heat differently than natural environments, and as these stations became surrounded by urban development, they began measuring the thermal impact of human expansion rather than reflecting natural climate conditions. Consequently, this has led to a misleading warming trend that bears little relation to global climate change.

Economist Ross McKitrick’s peer-reviewed research, featured in journals like Climate Dynamics, highlights another troubling trend: socioeconomic influences in temperature data. If these measurements were solely indicative of climate conditions, such patterns should not exist. McKitrick observed correlations between economic growth and recorded warming, suggesting that long-term temperature trends may be skewed by the development surrounding measurement sites rather than actual climatic changes.

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Perhaps the most striking evaluation comes from Stanford researcher Patrick Frank, whose statistical analysis indicates that “the average annual systematic measurement uncertainty is ±0.5°C, which completely vitiates centennial climate warming at the 95% confidence interval.” In layman’s terms, this means that the errors in measurement surpass the climatic changes being recorded. Frank concludes that “we cannot reject the hypothesis that the world’s temperature has not changed at all.”

The transition from mercury thermometers to digital sensors represents one of the most significant discontinuities in the 150-year global temperature record. Prior to digitalization, temperatures were gauged using mercury-in-glass thermometers, which were manually read at specific times each day. In contrast, modern digital systems utilize electronic sensors that continuously monitor temperatures, boasting different thermal response characteristics and relying on automated data processing. This shift means that measurements taken with digital systems are significantly more accurate and comprehensive than those recorded manually with mercury thermometers.

In the U.S., digital sensors began replacing analog instruments in the 1980s, making direct comparisons with earlier records unreliable. On a global scale, the adoption of digital systems didn’t gain traction until the 1990s and 2000s, rendering comparisons between U.S. and international temperature data invalid prior to full global standardization.

Moreover, early temperature records suffered from severe geographic bias, with measurements heavily concentrated in Europe and North America, while vast regions—including most oceans, polar areas, Africa, and Asia—had either sparse or no data. Ocean temperatures, which cover 71% of Earth’s surface, were particularly poorly recorded before the 1950s. This fundamental sampling problem means that scientists attempting to calculate “global” temperature averages were actually relying on data from a small fraction of the planet, then extrapolating those results to represent the entire Earth. The assumption that well-documented European and North American weather patterns reflect global conditions is scientifically dubious.

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To counteract acknowledged measurement problems, scientists apply extensive “corrections” and adjustments to raw temperature data through a process known as homogenization. However, these adjustments are often based on assumptions and subjective decisions that can introduce additional biases.

Different research groups employing varying adjustment methodologies can yield different temperature trends from the same raw data. The magnitude of these adjustments frequently parallels the climate signals being analyzed. When the corrections applied to data are as substantial as the trends being measured, the reliability of the measurements effectively diminishes.

Despite accusations that “climate deniers” are dismissing science, the implications of these flaws are profound. Trillions of dollars in policy decisions are predicated on temperature records where measurement errors exceed the very climate trends they are intended to demonstrate.

TAGGED:BlowDataflawsglobalholesNarrativeTemperatureWarmingYears
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