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<div class="">January 8, 2013</div>
<h1>Not Even Close: 2012 Was Hottest Ever in U.S.</h1>
<h6 class="">By
<span>
<a href="http://topics.nytimes.com/top/reference/timestopics/people/g/justin_gillis/index.html" rel="author" title="More Articles by JUSTIN GILLIS"><span>JUSTIN GILLIS</span></a></span></h6>
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<p>
The <a href="http://www.ncdc.noaa.gov/sotc/">numbers</a> are in: 2012,
the year of a surreal March heat wave, a severe drought in the Corn Belt
and a huge storm that caused broad devastation in the Middle Atlantic
States, turns out to have been the hottest year ever recorded in the
contiguous United States. </p>
<p>
How hot was it? The temperature differences between years are usually
measured in fractions of a degree, but last year’s 55.3 degree average
demolished the previous record, set in 1998, by a full degree
Fahrenheit. </p>
<p>
If that does not sound sufficiently 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
the <a href="http://www.weather.com/">Weather Channel </a>meteorologist Guy Walton, using federal temperature records. </p>
<p>
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. </p>
<p>
“The heat was remarkable,” said Jake Crouch, a scientist with the <a href="http://www.ncdc.noaa.gov/">National Climatic Data Center</a>
in Asheville, N.C., which released the official climate compilation on
Tuesday. “It was prolonged. That we beat the record by one degree is
quite a big deal.” </p>
<p>
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 new record would have been set without the
backdrop of <a href="http://topics.nytimes.com/top/news/science/series/temperaturerising/index.html">global warming</a>
caused by the human release of greenhouse gases. And they warned that
2012 was probably a foretaste of things to come, as continuing warming
makes heat extremes more likely. </p>
<p>
Even so, the last year’s record for the United States is not expected to
translate into a global temperature record when figures are released in
the coming weeks. The year featured a <a href="http://www.elnino.noaa.gov/lanina.html">La Niña</a>
weather pattern, which tends to cool the global climate over all, and
scientists expect it to be the world’s eighth- or ninth-warmest year on
record. </p>
<p>
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 who is under 28 has lived through a month
of global temperatures that fell below the 20th-century average,
because the last such month was February 1985. </p>
<p>
Last year’s weather in the United States 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.
</p>
<p>
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, Mr. Crouch said, but <a href="http://www.elnino.noaa.gov/lanina.html">not quite as severe as the legendary Dust Bowl</a> drought of the 1930s, which was exacerbated by poor farming practices that allowed topsoil to blow away. </p>
<p>
Extensive records covering the lower 48 states go back to 1895; Alaska
and Hawaii have shorter records and are generally not included in
long-term climate comparisons for that reason. </p>
<p>
Mr. Crouch pointed out that until last year, the coldest year in the
historical record for the lower 48 states, 1917, was separated from the
warmest year, 1998, by only 4.2 degrees Fahrenheit. That is why the 2012
record, and its one degree increase over 1998, strikes climatologists
as so unusual. </p>
<p>
“We’re taking quite a large step above what the period of record has
shown for the contiguous United States,” Mr. Crouch said. </p>
<p>
In addition to being the nation’s warmest year, 2012 turned out to be the second-worst on a measure called the <a href="http://www.ncdc.noaa.gov/extremes/cei/">Climate Extremes Index</a>, surpassed only by 1998. </p>
<p>
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, <a href="http://topics.nytimes.com/top/reference/timestopics/subjects/h/hurricanes_and_tropical_storms/index.html?inline=nyt-classifier" title="More articles about Hurricane Sandy." class="">Hurricane Sandy</a>, which caused damage likely to exceed $60 billion in nearly half the states, primarily in the mid-Atlantic region. </p>
<p>
Among those big disasters was one bearing a label many people had never heard before: the <a href="http://www.erh.noaa.gov/lwx/events/svrwx_20120629/">derecho</a>,
a line of severe, fast-moving thunderstorms that struck central and
eastern parts of the country starting on June 29, killing more than 20
people, toppling trees and knocking out power for millions of
households. </p>
<p>
For people who escaped both the derecho and 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.
</p>
<p>
Among the cities that set temperature records in 2012 were Nashville;
Athens, Ga.; and Cairo, Ill., all of which hit 109 degrees on June 29;
Greenville, S.C., which hit 107 degrees on July 1; and Lamar, Colo.,
which hit 112 degrees on June 27. </p>
<p>
With the end of the growing season, coverage of the drought has waned,
but the drought itself has not. Mr. Crouch pointed out that at the
beginning of January, 61 percent of the country was still in moderate to
severe drought conditions. “I foresee that it’s going to be a big story
moving forward in 2013,” he said. </p>
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