Another UHI Smoking Gun

According to USHCN raw daily data, afternoon temperatures in the US have declined more than one degree since 1930.

During that same period, US minimum temperatures have increased about a quarter of a degree

The next graph shows that the difference between maximum and minimum temperatures has dropped precipitously.

Strongly elevated nighttime temperatures are the primary symptom of the Urban Heat Island effect, which appears in cities and towns of all sizes.

New York   Phoenix    Barrow, AK

USHCN makes a token political adjustment of 0.1 degrees for UHI, but the actual effect is more like fifteen times larger.

About stevengoddard

Just having fun
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6 Responses to Another UHI Smoking Gun

  1. John B., M.D. says:

    More than 15 times larger, given your thermometer on your bike.

  2. Interesting that the BBC talk about UHI when it suits them.

    The predicted rise in temperatures in the coming decades will be exacerbated by what scientists call the “urban heat island effect”, in which temperatures during heatwaves can be 6-7C higher in cities than in surrounding areas.

    The new research, led by Professor Glenn McGregor of King’s College London, analyses data from recent heatwaves and concludes that the risk of heat-related deaths is greater in urban areas, especially in London.

  3. Sundance says:

    This an old paper from JPL measured the UHI in Southern California and showed that the increase in heat waves was due mainly to UHI. It is a look back at how warmists trot out the global warming hysteria every time there’s a heat wave. As Yogi Berra said, ” It’s deja vu all over again”.

    Click to access LAHeatWaves-JournalArticle.pdf

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