This website is the digital version of the 2014 National Climate Assessment, produced in collaboration with the U.S. Global Change Research Program.

For the official version, please refer to the PDF in the downloads section. The downloadable PDF is the official version of the 2014 National Climate Assessment.

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Welcome to the National Climate Assessment

The National Climate Assessment summarizes the impacts of climate change on the United States, now and in the future.

A team of more than 300 experts guided by a 60-member Federal Advisory Committee produced the report, which was extensively reviewed by the public and experts, including federal agencies and a panel of the National Academy of Sciences.

Explore the effects of climate change
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Figure 33.14: Warming Trend and Effects of El Niño/La Niña

Warming Trend and Effects of El Niño/La Niña

Figure 33.14: Trends in globally and annually averaged temperature when considering whether it was an El Niño year, a La Niña year, or a neutral year (no El Niño or La Niña event). The average global temperature is 0.4ºF higher in El Niño years than in La Niña years. However, all trends show the same significant increase in temperature over the past 45 years. The years for the short-term cooling effect following the Mt. Pinatubo volcanic eruption are not included in the trends. (Figure source: adapted from John Nielsen-Gammon 2012.1 Data from NASA GISS temperature dataset2 and Climate Prediction Center Niño 3.4 index3).

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References

  1. CPC, 2012: Historical El Nino/La Nina Episodes (1950-Present). National Weather Service, Climate Prediction Center. URL | Detail

  2. NASA, 2012: GISS Surface Temperature Analysis (GISTEMP). URL | Detail

  3. Nielsen-Gammon, J., 2012: Climate Abyss: About the lack of warming…. Houston Chronicle, 2012. URL | Detail

The National Climate Assessment summarizes the impacts of climate change on the United States, now and in the future.

A team of more than 300 experts guided by a 60-member Federal Advisory Committee produced the report, which was extensively reviewed by the public and experts, including federal agencies and a panel of the National Academy of Sciences.

United States Global Change Research Program logo United States Global Change Research Program participating agency logos