NOAA: 2012 Was Officially The Warmest Year On Record For The U.S., Second Most Extreme

Last year was officially the hottest ever recorded for the lower-48 states. Scientists at the National Oceanic and Atmospheric tallied weather and temperature data for 2012, and found that the year was both the warmest and the second-most extreme for weather ever recorded for the contiguous U.S.

According to NOAA’s latest “State of the Climate” report, the average temperature for the lower-48 states was 55.3°, which is 3.2°F above the 20th century average, and 1.0°F above the previous record-year of 1998.

Last year was marked by an historic drought, above-average wildfires, multiple freak storms that wiped out power to millions, and multiple severe heat waves. According to the U.S. Climate Extremes Index, 2012 was the second most extreme year on record — coming in below 1998, the previous hottest year on record.

Precipitation was also down significantly in 2012. Average rainfall for the lower-48 states was 2.57 inches below average, contributing to the severe drought that gripped the nation and helping make the wildfire season the third most destructive on record.

To see how these and other billion-dollar extreme weather events impacted Americans, check out the Center for American Progress report, “Heavy Weather: How Climate Destruction Harms Middle- and Lower-Income Americans.”

Here’s how NOAA breaks down last year’s temperature records:

U.S. temperature

  • Every state in the contiguous U.S. had an above-average annual temperature for 2012. Nineteen states had a record warm year and an additional 26 states had one of their 10 warmest.
  • On the national scale, 2012 started off much warmer than average with the fourth warmest winter (December 2011-February 2012) on record. Winter warmth limited snow with many locations experiencing near-record low snowfall totals. The winter snow cover for the contiguous U.S. was the third smallest on record and snowpack totals across the Central and Southern Rockies were less than half of normal.
  • Spring started off exceptionally warm with the warmest March on record, followed by the fourth warmest April and second warmest May. The season’s temperature was 5.2°F above average, making it easily the warmest spring on record, surpassing the previous record by 2.0°F. The warm spring resulted in an early start to the 2012 growing season in many places, which increased the loss of water from the soil earlier than what is typical. In combination with the lack of winter snow and residual dryness from 2011, the record warm spring laid the foundation for the widespread drought conditions in large areas of the U.S. during 2012.
  • The above-average temperatures of spring continued into summer. The national-scale heat peaked in July with an average temperature of 76.9°F, 3.6°F above average, making it the hottest month ever observed for the contiguous United States. The eighth warmest June, record hottest July, and a warmer-than-average August resulted in a summer average temperature of 73.8°F, the second hottest summer on record by only hundredths of a degree. An estimated 99.1 million people experienced 10 or more days of summer temperatures greater than 100°F, nearly one-third of the nation’s population.
  • Autumn and December temperatures were warmer than average, but not of the same magnitude as the three previous seasons. Autumn warmth in the western U.S. offset cooler temperatures in the eastern half of the country. Although the last four months of 2012 did not bring the same unusual warmth as the first 8 months of the year, the September through December temperatures were warm enough for 2012 to remain the record warmest year by a wide margin.

U.S. precipitation

  • The nationally-averaged precipitation total of 26.57 inches was 2.57 inches below average and the 15th driest year on record for the lower 48. This was also the driest year for the nation since 1988 when 25.25 inches of precipitation was observed.
  • The driest conditions during 2012 occurred across the central United States. Two states, Nebraska and Wyoming, had their driest years on record. Eight additional states had annual precipitation totals ranking among the bottom ten. Drier-than-average conditions stretched from the Intermountain West, through the Great Plains and Midwest, and into the Southeast. Wetter-than-average conditions occurred in the Pacific Northwest, where Washington had its fifth wettest year on record, as well as parts of the Gulf Coast and Northeast.
  • Each season of 2012 had precipitation totals below the 20th century average:

You can read the full report here. Climate Central has a killer interactive detailing the temperature data for each state here. And Peter Sinclair’s latest video, “2012: The Year Climate Change Got Real,” is basically the video version of this report.

9 Responses to NOAA: 2012 Was Officially The Warmest Year On Record For The U.S., Second Most Extreme

  1. Marie says:

    And the next warmest year was only 14 years ago. There is so much evidence of global warming, yet the deniers refuse to see it, much less take any remedial action.
    If they cannot even admit that humanity plays a large role, can’t they even admit to it happening and try to ameliorate it? Their politics has overwhelmed their reasoning.

  2. Pennsylvania Bob says:

    Does anyone know when we will have 2012 global temps…..and who will publish it? Sending US information such as this to denier friends always brings a response that it is freezing in (name of country or region here).

  3. Will Fox says:

    Can anyone explain this graph to me?

    Seems to be almost no warming forecast between 1998 and 2020.

  4. The Wonderer says:

    And of course in the Washington Post reporting of this story, Juliet Eilperin is compelled to insert 2 paragraphs of inane comments from our favorite deniers. This is maddening!

  5. prokaryotes says:

    2012: warmest and 2nd most extreme year in U.S. history

    Check out the NOAA graph…

    Temperatures for the contiguous U.S. in 2012, compared to the previous record warmest and coldest years in U.S. history. The annual U.S. average temperature was 3.3°F above the 20th century average, and was an astonishing 1.0°F above the previous record, set in 1998. It is extremely rare for an area the size of the U.S. to break an annual average temperature record by such a large margin. Image credit: NOAA/NCDC.

  6. prokaryotes says:

    Look how the LA Times reports this story (5 paragraphs) with the usual “conservative” jazz,0,1068210.story

    No graph, no video, no scientist warning about feedbacks let alone solution (less fossil burning).

  7. nyc-tornado-10 says:

    This website should update with the december temps some time next week. It shows the sep – nov period being very warm, the second highest on record. They may count the year as dec. to nov, because meteorological winter begins dec 1.

  8. Michael Spielman says:

    Second this. Not just surface temperatures, oceans too.

  9. prokaryotes says:

    CBS has a good video on this story

    2012 was warmest year in U.S. on record