It's official: 2012 was hottest year ever in U.S.

The New York TimesJanuary 8, 2013 

The numbers are in: 2012, the year of a blistering March heat wave, a severe drought in the Corn Belt and a massive storm that caused broad devastation in mid-Atlantic states, turns out to have been the hottest year ever recorded in the contiguous United States.

How hot was it? The temperature differences between years are usually measured in fractions of a degree but last year blew away the previous record, set in 1998, by a full degree Fahrenheit.

If that does not sound so impressive, consider that 34,008 daily high records were set at weather stations across the country, compared with only 6,664 record lows, according to a count maintained by Weather Channel meteorologist Guy Walton, using federal temperature records.

That ratio, which was roughly in balance as recently as the 1970s, has been out of whack for decades as the country has warmed, but never by as much as it was last year.

“The heat was remarkable,” said Jake Crouch, a scientist with the National Climatic Data Center in Asheville, N.C., which released the official climate compilation Tuesday. “It was prolonged. That we beat the record by one degree is quite a big deal.”

Scientists said that natural variability almost certainly played a role in last year's extreme heat and drought. But many of them expressed doubt that such a striking record would have been set without the backdrop of global warming caused by the human release of greenhouse gases.

Even so, the nation's 2012 record is not expected to translate into a global temperature record when figures are released in the coming weeks. The year featured a La Nina weather pattern, which tends to cool the global climate overall, and scientists expect it to be the world's eighth- or ninth-warmest year on record.

Assuming that prediction holds up, it will mean that the 10 warmest years on record all fell within the past 15 years, a measure of how much the planet has warmed. Nobody in the world who is less than 28 has lived through a month of global temperatures that fell below the 20th-century average, because the last such month was February 1985.

Last year's U.S. weather began with an unusually warm winter, with relatively little snow across much of the country, followed by a March that was so hot that trees burst into bloom and swimming pools opened early. The soil dried out in the March heat, helping to set the stage for a drought that peaked during the warmest July on record.

The drought engulfed 61 percent of the nation, killed corn and soybean crops and sent prices spiraling. It was comparable to a severe drought in the 1950s, Crouch said, but not quite as severe as the Dust Bowl drought of the 1930s, which was exacerbated by poor farming practices that allowed topsoil to blow away.

In addition to being the warmest year since extensive records for the contiguous United States became available in 1895, last year turned out to be the second worst on a measure called the Climate Extremes Index, surpassed only by 1998.

Experts are still counting, but so far 11 disasters in 2012 have exceeded a threshold of $1 billion in damages, including several tornado outbreaks; Hurricane Isaac, which hit the Gulf Coast in August; and, late in the year, Hurricane Sandy, which caused damage likely to exceed $60 billion in nearly half the states, primarily in the mid-Atlantic region.

For people who escaped Hurricane Sandy relatively unscathed, the year may be remembered most for the sheer breadth and oppressiveness of the summer heat wave. By the calculations of the climatic data center, a third of the nation's population experienced 10 or more days of summer temperatures exceeding 100 degrees Fahrenheit.

Among the cities that set temperature records in 2012 were Nashville, Athens, Ga., and Cairo, Ill., all of which hit 109 degrees June 29; Greenville, S.C., which hit 107 degrees July 1; and Lamar, Colo., which hit 112 degrees June 27.

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